i got a test pipe from speedy muffler and they didnt charge me for it cuz the same day i got my straight pipe. they made it a perfect fit, 2 o2 sensors, and brackets attached. im happy wit it but i juss got a smog ticket... so cat. goes back on. u can go to some muffler shops... go in person dont call... and if they r cool they will make u 1 and hopefully be smart to measure things b4 cuttin. my friends have spent like $50 on them... its a lot cheaper than a high-flow cat. but u will have to do some work to save urself that extra $100 or so.