I ran 15's. It was my first time ever running a car at the track...it was fun but i need some practice.

I did not use the factory tips. I wanted to keep my cat back from factory original just in case I had to take the car in for some warranty work. Any excuse the dealer can use to say "NO" they will...we all know that.

The tips were brand new stainless steel and I found them on ebay. I think they were listed for a vette. It was last year. My friend manages a muffler shop and he loves to work on cars. He bent the new exhaust and welded it all together, then he welded the new tips on. The exhaust bolts right up. I like it, but its loud when your on the throttle.