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ZZP 2.5 inch Stainless Cobalt/Ion Downpipe

Exhaust - ZZP 2.5 Inch Stainless Cobalt/Ion Downpipe
Exhaust - ZZP 2.5 Inch Stainless Cobalt/Ion Downpipe

This fits on all Cobalt/Ion/G5/HHR/Pursuit models with the 2.0L supercharged, 2.2, & 2.4L naturally aspirated cars. Will not fit '08+ turbocharged models.


    • Stainless flex

    • Stainless flanges

    • Stainless Spun metal cat 

    • Stainless piping

    • O2 bung and bung plug for wideband O2 sensor

Our downpipes are made from stainless steel. No worries about rusting or paint flaking off. It costs a little more but we feel it's worth it. All welding is done to the strictest of standards and bears a professional finish. Weld quality is higher than any other downpipe manufacture. We promise our welds to be 100% leak free. Even the flanges are stainless, which isn't something most companies can say. When shopping around, ask if the downpipe is 100% stainless, ask for a close up picture of their weld. You'll know right away, what true quality is and what it isn't.

The stock pipe narrows down to a 2" hole before flowing into the cat. This is very restrictive causing KR and a loss of HP. Our 2.5" stainless bolt in downpipe remove all of the stock downpipe restrictions. No more 2" inlet, no more O2 bung dimple. By doing so gains of over 15HP can be had along with a substantial drop in KR. Most users can drop a pulley size after adding our downpipe. Plus our 2.5" bolt in mates to the stock or 2.5" cat back exhaust system without any welding.
Transmission: This determines if you need a downpipe for an automatic or manual transmission.

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.

Exhaust - ZZP 2.5 Inch Stainless Cobalt/Ion Downpipe
Exhaust - ZZP 2.5 Inch Stainless Cobalt/Ion Downpipe
Customer Reviews
4.9 Based on 181 Reviews
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United States United States

Crazy Fast Shipping!

Took only 3 days to get delivered to me which is crazy fast for Normal Shipping. The Pipe looks very good overall ill be purchasing other items in the future

Travis G.
United States United States

Freaking Amazing!

Love this downpipe! Super easy install. Looks great and sounds amazing! Paired it with the 2.5" catback system for my cobalt. Freaking LOVE IT!!

Mikhail R.
United States United States

As good as the first one.

Second time purchasing this. Original GM design is just not very robust, that system needs another hanger to support that flex. OEM flex is load bearing so it lasts a little bit longer, but given the price of this downpipe and the DIY installation this fix is hard to beat.

Brian D.
United States United States

Down pipe

Looked good. Works good. Noticed a difference on acceleration. Wish it came with both gaskets.

Mason A.
United States United States

This product is amazing

First off this pipe is BEAUTIFUL, the welds are perfect and the install itself was very simple and straight forward. Plus i can tell a difference in power when i mash the go pedal