Where can I find a test pipe that will fit the stock exaust system?

 

I believe Bulletproofautomotive (site sponsor) sells a few. For some odd reason, the s2k straightpipe is expensive as hell. I would just go to a good exaust shop and have one made. 300+ on a stupid pipe is insane.....shops that work with american cars and exaust systems should do it for 100 bucks.