ZZP GXP Downpipe


29 reviews

This variant is currently out of stock

Stock downpipes are double-walled tubing with an inside diameter of just over two inches. Gains of over 10HP have been seen along with a substantial drop in knock. This part can typically be installed in under an hour.

Our downpipes are made from high quality stainless steel. Even the flanges are stainless, which isn't something any other company offers. This ensures a lifetime of rust-free operation and eliminates the need for paint that could flake off. Stainless costs a little more but we feel it's worth it. All welds are held to the strictest of quality control standards to ensure a professional finish. Our weld quality is higher than any other downpipe manufacturer. When shopping around, ask if the downpipe is 100% stainless, and ask for a close up shot of their welds. Compare them to ZZP's downpipes, and it will be apparent why ZZP's downpipes are leaps and bounds ahead of the competition.

Exit option: The default, or stock, downpipe exit will come with a 2.5" flange. This is the stock size and will allow you to bolt it in with the stock exhaust, or any aftermarket 2.5" catback. If you have a 3" catback, or are planning on purchasing a 3" catback, you will want the 3" exit option. The 3" option will not fit with the stock exhaust. 

Bolt in with cat downpipes can be used on stock to highly modified cars. We use Magnaflow, high flowing catalytic converters. They bolt into a stock or aftermarket cat back exhaust system. They include an O2 bung for the rear factory O2 sensor. 

Interlock flex (sometimes called turbo flex) is the best flex money can buy. Typically, the downpipes in our market use a single wall flex. This is durable but has a ribbed inside design that can disrupt airflow. This type of single wall flex is what people are running when you hear them complain about a whistling or ticking noise coming from their exhaust section. To remedy these issues, you can buy a double braided flex which has braided stainless on the inside, as well as outside, of the flex. The problem is that they fail very easy on supercharged cars. Interlock flex is the 3rd solution and while is costs more, it is the best. It withstands the higher temperatures of boosted applications and provides a flat smooth surface for the exhaust gas to run over. 

Please use factory torque specs when installing our downpipes.

Fits 5.3L Impala SS, Monte Carlo SS, and Grand Prix GXP. Does not fit Bonneville GXP. 

Shipping charges are based on dimensional weight.

Customer Reviews
4.8 Based on 29 Reviews
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Ryan R.
United States United States
07 GP GXP + GXP Downpipe

Bought this downpipe to replace the stock unit and it sounds really good and you can definitely tell it’s flowing better with my CAI. Installation was very easy and everything lined up perfectly. Only issue I had was rust but that isn’t the parts fault. Just keep in mind you’ll need to get yourself header to dp and dp to resonator gaskets, as they are not included. Overall, still a great purchase and won’t be my last.

Scott C.
United States United States
Huge improvement

The quality of this downpipe is outstanding. I used it to replace a Pacesetter downpipe. After installing the ZZP downpipe, I immediately noticed a real increase in power and it sounds much deeper. Very happy with this piece.

Les S.
United States United States

I have yet to receive my downpipe. I ordered it nearly a month ago and realized immediately that I hadn’t specified that I wanted a 3” outlet. I immediately emailed and addressed the issue with my order number and it still was shipped wrong. After paying $40 for shipping to return it, the website was complicated in paying the extra fee to have my pipe modified and I was then told I did it wrong when I had no choice as to how the site displays my options. I can’t wait to get my pipe so that I can finish my exhaust!! Probably won’t ever buy here again

Thaddeus P.
United States United States

5 star great quality

John M.
United States United States
Gxp Downpipe.

Good price. Easy to install.