I have heard of them, took my car there to have them weld on a high flow cat (the dealer recommended them) they pulled the car in, I heard them cutting and welding so i assumed they did the job, the car sounded quieter when i drove it so high flow installed, right? Wrong... Took it to Pepboys shortly after cause I needed an inspection and they didnt do anything more than cut the midpipe and reweld it. Luckily I didnt have to pay for it... I would not recommend going there.