OK,

BEEN doing A LOT of work on my 05 ZR. I already replaced the exhaust system. It came with test pipes but I did not install them leaving the cats alone.

My question, is this- how much ACTUAL gains in horsepower did any of you get by switching over to test pipes? As in dyno gains, quicker lap times or quicker runs on the strip?

Is it worth the effort on a bone stock motor?

 

I doubt anyone tested on a dyno just for that, but I'll assume it would be 5-10hp and a whole lotta noise.

 

When I went from Stock Cats to Resonated test pipes (04 DE), it was a noticeable difference. IMHO it is not cheap to liven up our car, but it can be done. Do everything you can to reduce your unsprung mass. This will make the car feel better.

 

Stitch did really well at the autocross this weekend. We didn't switch over to our race rubber, so with all the suspension upgrades in the front, even on Michelin Primacy tires, we had competitive times.

Just trying to be competitive. And have fun.

 

These are great cars to Auto-X with some suspension work, and tires they will hang with most.