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RhinoFLA
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PostSubject: Hogan Downpipe   Fri Jul 06, 2007 12:51 am

Just a heads up, the 3 inch hogan downpipe made for 97+ bonnevilles is compatible with all 97+ rivieras, it's a 4 bolt flange, so if you're like me and don't have access to welding talent, it's true bolt on. I emailed them about it, and just got a response back today.


http://hoganperformance.com/DP8S.htm
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AA
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PostSubject: Re: Hogan Downpipe   Fri Jul 06, 2007 1:14 am

Great find! Are you going to buy one? That's a really promising mod according to that dyno sheet.

_________________
'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
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RhinoFLA
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PostSubject: Re: Hogan Downpipe   Fri Jul 06, 2007 1:19 am

yeah, I wanna go with that one, but i'm still debating if it's worth it to spend the cash on a dp, or just save it for headers
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AA
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PostSubject: Re: Hogan Downpipe   Fri Jul 06, 2007 1:29 am

Here's my feelings on our exhaust: for the money and install time, a 3" down pipe is a much better improvement than headers. You get 10 hp with that down pipe vs. maybe 15 hp with headers. It's 1/6 the cost, and twice as easy to install. Plus, you won't have the noise/harshness that headers have.

Unless you want the absolute most power possible, and you plan on modding quite a bit more, I'd try out the pipe. pimp

_________________
'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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RhinoFLA
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PostSubject: Re: Hogan Downpipe   Fri Jul 06, 2007 1:42 am

yeah, good advice, I wasn't sure how much more hp the headers were pulling.. doesn't seem like too hard of an install
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Jack the R
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PostSubject: Re: Hogan Downpipe   Fri Jul 06, 2007 3:00 pm

Is it an either/or deal? DP or headers but not both?
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AA
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PostSubject: Re: Hogan Downpipe   Fri Jul 06, 2007 3:01 pm

Yes, it's either/or. SLP headers come with down-pipe built in, called a flex-pipe. Chances are other header varieties would not mate up with any of the available down pipes.

_________________
'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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Jack the R
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PostSubject: Re: Hogan Downpipe   Fri Jul 06, 2007 9:13 pm

The built in SLP downpipe isn't as big as the Hogan pipe?

Crikey, if it's a 5 hp difference between headers and the DP, and you can't use both, why not get a DP and, uh, what are they called - togs? The smoothed out manifolds?
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AA
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PostSubject: Re: Hogan Downpipe   Fri Jul 06, 2007 9:24 pm

With more serious mods, like a cam, rockers, or very small SC pulleys... headers should outflow any downpipe/PEM combo. SLPs are advertised giving "up to 25hp gain" But if you only have a few things done to the engine, they are a bit overkill, imo. They really work when you're trying to flow a lot of air.

_________________
'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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jax95riv
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PostSubject: Re: Hogan Downpipe   Fri Jul 06, 2007 11:03 pm

From what I've read in other threads the DP's don't fit real well,
something about the gasket doesn't match up right? Is one DP a better fit than another?? I need to get educated about this stuff...
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AA
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PostSubject: Re: Hogan Downpipe   Fri Jul 06, 2007 11:21 pm

This pipe is fitted for the Bonne. Has anyone tried a Bonnevile DP on a RIv?

_________________
'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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PostSubject: Re: Hogan Downpipe   Fri Jul 06, 2007 11:30 pm

One more mod to add to the list... that was supposed to be shrinking. I AM interested in doing a DP, bolt-in would be the way for me to go.
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AA
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PostSubject: Re: Hogan Downpipe   Fri Jul 06, 2007 11:46 pm

I'm betting a big company like Hogan would have a return policy if it didn't fit? Who's going to be first?

_________________
'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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racinfan
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PostSubject: Re: Hogan Downpipe   Sat Jul 07, 2007 2:26 am

How does that dp manage to fit on 2 different generations of Bonnevilles?

The dyno car wasn't stock...It looks like it has a 3.4" w/supporting mods before the dp so I imagine it would benefit the modded car more than a stock car.
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RhinoFLA
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PostSubject: Re: Hogan Downpipe   Sat Jul 07, 2007 1:47 pm

They do say it bolts right up on all 97+ rivieras, so like Aaron said, i'm sure they would take it as a return if for some reason it didn't fit..
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PostSubject: Re: Hogan Downpipe   Sat Jul 07, 2007 5:49 pm

RhinoFLA wrote:
They do say it bolts right up on all 97+ rivieras, so like Aaron said, i'm sure they would take it as a return if for some reason it didn't fit..

I would make sure to ask them first before you order. I bet they have a restocking fee or something to go along with it.
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PostSubject: Re: Hogan Downpipe   Sat Jul 07, 2007 9:01 pm

I emailed an inquiry, asking if they had test fit these to a Riv. I'll bet not, or they would list the application on their site.
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PostSubject: Re: Hogan Downpipe   Sat Jul 07, 2007 10:50 pm

The riv and bonneville have the same DP p/n.

The slp knock offs are only 40$ more than that DP, but you don't have the convenience of being a bolt in.
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PostSubject: Re: Hogan Downpipe   Sun Jul 08, 2007 11:53 am

Curt Hogan replied to me this morning. Looks like I'll give this a try at some point, maybe later this summer.

Quote :
Thank you for the interest. Yes, our DP8S is a direct fit party for the Rivera in 97, 98 and 99 only.This pipe bolts to the factory manifold and to the inlet flange on the catalytic converter. Installation requires A GT1 gasket at the upper connection and a GT3 at the lower. If you are interested in purchasing these items the cost is as follows.
DP8S 139.95 plus 10.00 with optional interlock flex for tick and whistle free operation.
GT1 13.00
GT2 5.00
S&H 17.50 (Lower 48 States)
If you wish to order, please make PayPal payment to Belair427@cox.net
and we will ship within 48 hours.
Thank You
Curt Hogan
Hogan Performance
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AA
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PostSubject: Re: Hogan Downpipe   Sun Jul 08, 2007 4:24 pm

thumbsup All systems go...

Why not include '96s?

_________________
'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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http://www.cardomain.com/ride/657082/4
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PostSubject: Re: Hogan Downpipe   Sun Jul 08, 2007 6:29 pm

dunno...
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PostSubject: Re: Hogan Downpipe   Mon Jul 09, 2007 8:24 am

gonna rust up an fall off.... 409 SS an steel flanges....
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PostSubject: Re: Hogan Downpipe   Mon Jul 09, 2007 12:41 pm

AA wrote:
thumbsup All systems go...

Why not include '96s?

b/c the 96's do not have bolt up flanges. ours is welded to the cat and has a different bolt-up at the collector. the zzp DP will work on the 96's but it must be welded in place and the upper gasket is a dounut type not a flat gasket. i have very little leaking with my zzp dp, and i reused the stock gasket even tho it is a little bit small. i also used 3" pipe all the way to the resonator wink
also the holes on the zzp/aftermarket dp's do not directly line up with the 96 holes so they must be drilled out a little bit.

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PostSubject: Re: Hogan Downpipe   Mon Jul 09, 2007 3:11 pm

TType_Riviera wrote:
gonna rust up an fall off.... 409 SS an steel flanges....

You think the steel flange won't hold up for an acceptable length of time? Or is it the 409 SS you're doubting? I'm not familiar with the specs on 409SS, we deal with 304 and 316 where I work.
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PostSubject: Re: Hogan Downpipe   Mon Jul 09, 2007 3:50 pm

If read the 409 develops a surface rust, but that is supposed to be a protective coat that prohibits further corrosion. If the 409 is coated, it should last. My headers are 409. If I bought the Hogan DP, I might see about having it Jet coated, if they could do it with the braided section, I don't know.

_________________
'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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