I just installed an HKS 2,5" downpipe with a JIC stainless catback exhaust and I am very impressed with the quality. I purchased the products as well as a Rallyart replacement air filter from Vivid Racing. I had a great experience from Mike at Vivid and had the products delivered on time as promised.

I also purchased a Perrin cat delete pipe, but I'm not sure if I will install it or not.

The Power felt really good and the sound was only slightly louder than stock. I played with the adjustable baffle in the muffler, but decided to remove it completely. There was an imediate increase in performance and also sound. There is no annoying resonance in the car. I'm very happy.

 

Not if you have the ultimate racing test pipe. i heard perrin test pipe has a fix too?

 

Yes, Perrin does include a sensor that goes in line with the O2 sensor and is supposed to eliminate any check engine lights from the upgrade.

J