Some things he's done have been okay, I've just seen too many that have turned me off them full stop. Not saying everything he does is terrible, plenty of guys on SAU and other clubs have had good work from him. It's just not for me...
Edit: I should explain these are RB26 front pipes made on the car for an R33 GTR, it hangs super low and the pipe is oval.. The cat is replaced by a rectangular small magnaflow muffler and does nothing for quieting the car down.