ZZP Downpipes

AA wrote:

Don't know, but you might be able to use a pipe expander to make it work.

More than likely. But the problem is the length. I'm not sure that would be enough to replace the cat. Summit sells 3 inch piping, 4 feet for 12 bucks or something. Or I could go to a local muffler shop and ask them to cut me a 3" dia. piece however long it would take.

I only used about 3.5" because I also put in a Flowmaster venturi cone (very gradual taper from 3" to 2.5", and I did this before the resonator.

If you get a custom length cut, ask for stainless.

i got my 1.5' piece of 3" steel straight pipe at autozone. it was like $8 IIRC, but dont quote me. hasnt rusted yet btw

Is that what you needed to replace the cat?

Hi guys I want to get some nice headers and a downpipes, with a cat do to dumb utah laws. So for this hogan downpipes, should I just get one with a cat? Or buy a magnaflow one separate? And the main question, does it bolt right on?

http://www.3800performance.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=HP-DP3&Category_Code=ES_H&Product_Count=24

97+ has a bolt in cat. We have the 96, which is welded in. Aftermarket headers come with a downpipe but not usually a cat.

So I would have to weld? Which isn't a big deal. And get a separate cat?

Yes.

I have a 96 also, what downpipe is better for that year Hogan or zzp or does it matter? I heard either way I need to get it welded with some grinding of the stud holes

I'm pretty sure the ZZP H-body downpipe is the best fit. They even advertise them for the Riviera, plus they are the chepest

They are. You just need to clamp/weld the high flow cat in. Other than that it's bolt in.

Zzp it is then, I still need to have it welded to the manifold flange though right?

No. It will bolt up to that.

Sounds like I'm going zzp to thanks guys!

I've had a zzp 3 inch dp sitting in my closet for close to 3 years now, i should probably do something with it sometime

I ended up buying the Hogan hbody downpipe with the welded magnaflow cat, hopefully it bolts up to the flange like stated earlier, the zzp hbody deletes the cat which I can't have in my state.

h20man wrote:

I ended up buying the Hogan hbody downpipe with the welded magnaflow cat, hopefully it bolts up to the flange like stated earlier, the zzp hbody deletes the cat which I can't have in my state.

ZZP has a option for a cat in the drop down menu, $189

h20man wrote:

I ended up buying the Hogan hbody downpipe with the welded magnaflow cat, hopefully it bolts up to the flange like stated earlier, the zzp hbody deletes the cat which I can't have in my state.

Sweet man, what year is your riv? Let me know how it goes putting it on any troubles and such.

When you put a downpipe on with high flow cat is exhaust louder any other brands of cats anyone try

bmcd9179 wrote:

h20man wrote:

I ended up buying the Hogan hbody downpipe with the welded magnaflow cat, hopefully it bolts up to the flange like stated earlier, the zzp hbody deletes the cat which I can't have in my state.

Sweet man, what year is your riv? Let me know how it goes putting it on any troubles and such.

I have a 96, I'm having a shop do the down pipe and weld a system up all at once

Oh really? Let me know how it goes, performance wize!

Will do, my downpipe should be at my work today!