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rivwilly107
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PostSubject: Hogans DP10S or ZZP ?   Tue Jul 01, 2008 10:46 pm

Need a 3' downpipe and Catalytic Converter .Hogans performance has one for a Bonneville thats 280.0..ZZP has a Bonneville downpipe it is as follows ZZP downpipe for Bonneville
VIN :
Size:3" full length weld in
Model:304 Stainless steel
Option 1:Magnaflow cat
Its around 220.00.Is there a quality difference?Would like to order from ZZP ,online ordering is easier, but I want to make sure it's everything I need .
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rivwilly107
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PostSubject: Re: Downpipe L67   Wed Jul 02, 2008 10:04 am

Anyone with an oppinion on this?My Powerlog and crossover arriving today .Installing this weekend.Id like to order my downpipe and cat early next week.Just not sure which to go with.
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1998 Riv
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PostSubject: Re: Downpipe L67   Wed Jul 02, 2008 10:25 am

I thought ZZP's DP for the Bonne's was also a Hogan part? I know other 3800 vendors list Hogan's DP for sale.

Oh, maybe not. Hogan's is 409 stainless, not 304. 304 would be a better choice, durability-wise.
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PostSubject: Re: Downpipe L67   Wed Jul 02, 2008 10:26 am


_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


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1998 Riv
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PostSubject: Re: Downpipe L67   Wed Jul 02, 2008 10:31 am

ZZP looks like a good deal. 3" 304SS DP with Magnaflow cat, for $220. Bolts to the rear manifold, you need to cut off the old unit behind the oem cat, then weld new one to the resonator, or clamp it. Mine is clamped. Might want to confirm they have the O2 bung on the cat. Mine came with the bung from Hogan.
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rivwilly107
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PostSubject: Re: Downpipe L67   Wed Jul 02, 2008 11:30 am

Just spoke with Curt at Hogan.I just have to get him some measurements and he can build the dp and cat to my needs.Price is a little cheaper as a combo.He says there are 4 or 5 different measurement combonations he has seen with our set up.I called ZZP also, didn't get the same level of expertise from them.They said alot of "hmmm not sure we haven't tried that yet."So I think I'll go with Hogans.
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1998 Riv
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PostSubject: Re: Downpipe L67   Wed Jul 02, 2008 1:09 pm

I have Hogan's Bonne 3" DP and Magnaflow cat, purchased from them separately. The fit is perfect, but you or a shop needs to cut off right behind the old cat in order to weld or clamp in the new. Are you wanting them to make you a one-piece combo? I'd stick with the DP and Cat as separate, bolt-together parts.
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rivwilly107
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PostSubject: Re: Downpipe L67   Wed Jul 02, 2008 1:32 pm

1998 Riv wrote:
I have Hogan's Bonne 3" DP and Magnaflow cat, purchased from them separately. The fit is perfect, but you or a shop needs to cut off right behind the old cat in order to weld or clamp in the new. Are you wanting them to make you a one-piece combo? I'd stick with the DP and Cat as separate, bolt-together parts.
Did you put yours together yourself?Did it need any major modding? Thanks for your help Dave.
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1998 Riv
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PostSubject: Re: Downpipe L67   Wed Jul 02, 2008 1:44 pm

I intended to, but my stock DP -to- Cat mounting bolts and nuts were so badly corroded I couldn't get a single one off. And I had planned to have the new cat welded to the stock resonator anyway, so I had a good local exhaust shop do the install. Ended up clamping it though. Really no modifications other than cutting the old cat out at the right distance in back, in order to weld or clamp in the new one. I also rarely have a lot of free time to spend on this stuff, so the shop install was a hell of a lot faster than it would have taken me. I think a lift would be a big plus...
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PostSubject: Re: Downpipe L67   Wed Jul 02, 2008 2:33 pm

I had a Hogan that was their Bonne prototype built for another guy. The quality etc was fantastic. Add that the customer service and I think Hogan is the way to go.
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1998 Riv
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PostSubject: Re: Downpipe L67   Wed Jul 02, 2008 4:10 pm

Ditto on Hogan's quality, and customer service.
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PostSubject: Re: Downpipe L67   Thu Jul 03, 2008 2:01 am

I talked to Curt, and I agree with everyone...

This guy is just great. And I love my downpipe, it's rock solid!
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PostSubject: Re: Downpipe L67   Thu Jul 03, 2008 3:11 pm

Ordered Hogans downpipe and cat.Will be here next week!
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PostSubject: Re: Downpipe L67   Thu Jul 03, 2008 3:45 pm

imo you should have just saved on got headers.
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AA
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PostSubject: Re: Downpipe L67   Thu Jul 03, 2008 3:54 pm

The Hogan is a good product. So is P-log. They should make a decent improvement.

Not everyone needs to install headers. You really have to do some other stuff to make them worthwhile. Not everyone wants the added noise, either. Plus, headers are not street legal in most states.

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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1998 Riv
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PostSubject: Re: Downpipe L67   Thu Jul 03, 2008 4:26 pm

AA wrote:
....................
Not everyone needs to install headers. You really have to do some other stuff to make them worthwhile. Not everyone wants the added noise, either. Plus, headers are not street legal in most states.


All very true.
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rivwilly107
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PostSubject: Re: Downpipe L67   Thu Jul 03, 2008 4:34 pm

1998 Riv wrote:
AA wrote:
....................
Not everyone needs to install headers. You really have to do some other stuff to make them worthwhile. Not everyone wants the added noise, either. Plus, headers are not street legal in most states.


All very true.
I tried to weigh all options, pros and cons.I was able to do all my own work , no bending ,cutting,swearing. Out of the box and on my car in an hour.One minor problem, that was my own fault though.
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PostSubject: Re: Downpipe L67   Thu Jul 03, 2008 9:26 pm

I've decided against the headers because I'll never do a CAM.

I was thinking about rockers, but to be honest, I just want to make sure my car stays in tip-top shape with a little extra power in it, which it does have right now, but that stock front manifold is just too small.

I've got PLENTY of 60k mile stuff I need to do before I can think about mods past the P-log... and after that's all said and done, I know this car isn't going to be super fast, and I've accepted it.

Are headers recommended with rockers? Because aren't you flowing more air or something?

Anyway, p-log is easier to install as well. Even more money/time saved.
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PostSubject: Re: Downpipe L67   Thu Jul 03, 2008 9:41 pm

[quote="

[quote="Are headers recommended with rockers? Because aren't you flowing more air or something?
Thats a good question.I would like to do rockers this winter.Maybe AA will chime in on this one.Do headers need to be installed for rockers to be fully effective . Does a Plog ,rear Pem 3''downpipe with high flow cat open it up enough?
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PostSubject: Re: Downpipe L67   Thu Jul 03, 2008 9:42 pm

AA wrote:
Not everyone needs to install headers. You really have to do some other stuff to make them worthwhile. Not everyone wants the added noise, either. Plus, headers are not street legal in most states.

very true, i misjudged, just looking at how he is doing his mods, i figured he wanted the best bang for the buck
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PostSubject: Re: Downpipe L67   Thu Jul 03, 2008 10:54 pm

There's no definite right or wrong answer to this. It has to do with how much you want to spend, how much NVH you can tolerate, and if you are willing to "technically" break the law. Also, there's something about headers that just says you're serious about engines and modding.

I think headers are always going to flow better than ported manis or P-log + downpipe, but unless you have other mods to push air into and through the engine, I don't think the advantage is that much. You put headers on a stock car, I think the gain is only slightly better than a P-log + downpipe. You put headers on a cammed engine with IC and 2.8" SC pulley, you'll rreally feel it. Having rockers + 3.3" puts me somewhere in the middle.

Part of me wanted headers because I used to think I would mod a lot further than I did. The other part wanted them just because I think they are cool! I wanted a little less luxury and a little more hotrod in my daily ride.

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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rivwilly107
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PostSubject: Re: Downpipe L67   Thu Jul 03, 2008 11:08 pm

AA wrote:
There's no definite right or wrong answer to this. It has to do with how much you want to spend, how much NVH you can tolerate, and if you are willing to "technically" break the law. Also, there's something about headers that just says you're serious about engines and modding.

I think headers are always going to flow better than ported manis or P-log + downpipe, but unless you have other mods to push air into and through the engine, I don't think the advantage is that much. You put headers on a stock car, I think the gain is only slightly better than a P-log + downpipe. You put headers on a cammed engine with IC and 2.8" SC pulley, you'll rreally feel it. Having rockers + 3.3" puts me somewhere in the middle.

Part of me wanted headers because I used to think I would mod a lot further than I did. The other part wanted them just because I think they are cool! I wanted a little less luxury and a little more hotrod in my daily ride.
Do you think that with a 3.4 pulley , downpipe , Plog ,rear Pem ,and a high flow cat I would feel the benefit of 1.91 rockers?also what are the chances I could run a 3.3 pulley? I know that scanning is the key, just looking for your opinion.
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PostSubject: downpipe   Tue Aug 26, 2008 9:56 pm

hey I have a question witch downpipe do u guys recomed for my 96 sc riv?
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PostSubject: Re: Downpipe L67   Tue Aug 26, 2008 11:31 pm

I believe what you're looking for a is a 3" Shorty from ZZPerformance. The pipe they sent for the GTP was supposedly a shorty but it replaced the cat. I thought the shorty was supposed to be the one that allows you to leave the cat, so if you wanted to keep it I'm not sure which is the right one to go with (I would like to know this as well as a 3" DP is somewhere in my future mods and I want to leave my cat).
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PostSubject: Re: Downpipe L67   Wed Aug 27, 2008 1:31 am

I used the 3" shorty , had to argue with them a bunch to get them to do it , but they reused the factory flange and cat.
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