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H-Body Downpipe

ZZPerformance now carries a full length downpipe for the Bonneville, Park Avenue, Riviera & Olds 88 LSS.

The OEM Bonneville downpipe is about 12" long and bolts to the front of the cat with 4 bolts. The factory cat-back exhaust includes the cat on the H-Body car. This is a weld or clamp in downpipe and ends right before the factory resonator.

We are currently offering $100 in store credit to purchase your stock catalytic converter back from you. If you're interested, take a photo of your stock downpipe and email it to We will provide prepaid shipping labels for domestic (U.S.) shipments.


Customer Reviews
4.8 Based on 20 Reviews
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Kevin W.
United States United States
Nice downpipe

I needed to replace my cat and resonator on my 2002 Pontiac Bonneville SSEi (L67). I wasn't looking for a downpipe until I found the ZZP downpipe with flex tube, and catalytic convertor already included. This complete downpipe was less expensive than purchasing a comparable catalytic convertor alone. The downstream O2 **** was 2 inches off (closer to the engine) from the stock pipe since this product is more streamlined and isn't as long (or bulky) as the stock pipe. But repositioning the O2 sensor was not difficult. No problems with mating the ZZP pipe with the manifold ****** (it was nice to have another pair of hands and eyes helping from the engine bay while I was under the car). I also installed the ZZP 20-inch universal resonator to replace my stock resonator. When idling, the car still sounds as it did before but, when revving the engine (along with my in-fender cold air intake), there is a noticeable increase in growl/purr (in a good way!) of the car's original sound - and this is with the stock mufflers currently in place (which will soon be upgraded). If you need to replace your catalytic convertor I would highly recommend this downpipe AND a ZZP resonator (all stainless steel!!). The photo compares the stock downpipe, cat, and resonator to the ZZP H-Body downpipe and resonator side-by-side.

ZZPerformance H-Body Downpipe Review
Parker E.
United States United States
Hbody downpipe

Gave my bonneville ssei a very nice deep exhaust note. I would buy it all over again. Only complaint is its throwing a catalytic converter code so my check engine light is on.

ZZPerformance H-Body Downpipe Review
Trevor .
Quality work

I have seen some other reviews about not having an O2 ****, mine did come with it. And the car sounds so much better. It was an easy install, and also has much better flow. Love the zzp team and products

ZZPerformance H-Body Downpipe ReviewZZPerformance H-Body Downpipe Review
United States United States

WOW! Not only has this downpipe surprised me in performance it just down right feels good! I'm not the type to write reviews at all and I'll get straight to the point. WOW. With that being said over the factory down pipe and having it it professionally installed made the world of difference! Not only does the car just sound so damn quiet(which I don't like personally)its a 97 Buick Riviera with 234k and still pulling strong. Anyways, The mid Rpms was always my biggest downfall with this engine. Not anymore! This downpipe just down right kicks ***! Only bolt on I have and everything else factory this feels like I got a shift kit with motor and trans mounts replaced! Please buy this. I still have yet to install the powerlog headers until this weekend. Will update on performance in the downpipe section. THANKS ZZP!!!

Zach T.
United States United States
Great product

When on the gas it gives great deep sound 100% worth it