Skip to main content

Your Cart

Your cart is currently empty.
Click here to continue shopping.

H-Body Downpipe

ZZPerformance now carries a full length downpipe for the Bonneville, LeSabre, 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.

Our downpipes come with a high flow catalytic converter that is 48 state legal. Our catalytic converters will not pass California or New York state emissions. Please contact if you have any questions.

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
4.7 Based on 24 Reviews
5 ★
4 ★
3 ★
2 ★
1 ★
Customer Photos
Write a Review Ask a Question

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
  • engine
  • downpipe
  • sensor
  • Shipping
  • performance
  • sound
  • cold air intake
  • reviews
  • RPMs
  • heat shield
Dave D.
Canada Canada

Nice lookin but poor fit

The pipie hangs too low for G body ( Riviera) and hits speed bumps and contacts the PS lines. The O2 sensor **** is clocked at 4 oclock instead of 3 oclock and is too far back to fit the steel sheild on the floorpan.

ZZPerformance H-Body Downpipe ReviewZZPerformance H-Body Downpipe ReviewZZPerformance H-Body Downpipe Review
Alicia B.
United States United States

Well made!

The price was great! Shipping was fast! Fit perfectly!

Craig H.
United States United States

Great product. Fit well on my 1997 Park Ave Ultra

Well made unit. Especially considering a new cat is like $170 and way smaller.

Timothy H.
United States United States

Could be better

The hole for the 02 sensor was off so it does not line up %100 but I little modifications to the heat shield and I was able to get it in some what.

ZZPerformance H-Body Downpipe Review
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