ZZP GXP Downpipe

Exhaust - ZZP GXP Downpipe

ZZP GXP Downpipe

39 reviews
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Regular price $294.99
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  • In stock, ready to ship
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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.

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 customerservice@zzperformance.com 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 Henry@zzperformance.com. We will provide prepaid shipping labels for domestic (U.S.) shipments.


Customer Reviews
4.8 Based on 39 Reviews
5 ★
82% 
32
4 ★
15% 
6
3 ★
3% 
1
2 ★
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BK
05/15/2022
Brent K.
United States

GXP Downpipe

Overall great looking product all parts came along will order more from ZZP

ZB
05/08/2022
Zachary B.
United States United States

Quality

Love the sound makes it kackle nice deep tone quality stainless not cheap thin **** either

RR
05/01/2022
richard r.
United States United States

2007 grand prix GXP 5.3

pipe looks good,havent had a chance to install yet so I cannot say anything about the misalignment issue with the exhaust pipe end,hopefully they have addressed that issue and the gaskets you need are felpro number 61465 and 61310.

K
02/21/2022
kory
United States United States

2005 GRAND PRIX GXP 5.3L LS4

Really was worried that the unit was going to be a stainless knock-off.... BUT HOLY SMILES PER GALLION DOES IT MAKE A DIFFERENCE DEEP THOAT SOUND YOUR LOOKONG FOR. I MEAN LET'S BE HONEST NO ONES IS LOOKING FOR THIS DOWN PIPE UNLESS THEY WANT SOLID SOUND SO FOR ANYONE WANTING TO KNOW YES THE 3INCH PIPE WITH 2.5 OUTLET IS JUSTVAS LOUD AS THE 3INCH OUTLET SO IF YOU HAVE STAINLESS FROM KAT BACK OR STOCK IT BOLTS UP PERFECTLY.. #1 IT DONT COME WITH HARDWARE SO GO GET YOU SOME 10MX1.25TH BOLTS AND NUTS 2.5-3INCH LONG BEFORE YOU REMOVE YOUR OLD UNIT PLUS THE GASKETS AT BOTH ENDS THEN G2G... 2# YES IT DOESN'T COME WITH GASKETS SO WHAT TAKE IT FROM ME THE UNIT I GOT HAS SOME FLAWLESS WELDS THAT I CANT EVEN SNAG MY SKIN ON SO IF YOUR THINKING PICTURES LOOK GOOD TRUST ME WAIT TILL YOU GET YOUR SOVER ALL 5 STARS SINCE I CAN'T GIVE 10 PLUS TO THUMBS SKY HIGH!!!!!

ZZPerformance ZZP GXP Downpipe ReviewZZPerformance ZZP GXP Downpipe Review
AL
01/23/2022
Anthony L.
United States United States

Well made

It's a high quality performance product as advertised. I like it.

ZZPerformance ZZP GXP Downpipe Review
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