okay check this out. there is no place that carrys 18mm screws. but i happen to found one that fit which was a spark plug screw cleaner. i fixed it, tighten it and my next problem was that the bic down pipe had a.... flap of some sort that comes off the end of it. i welded that off and installed the ddp. and i have never been happier with anything before. it is LOUDDD!!!!! at full boost. still boosting 6lb but it feels more toqurier and faster. it has those random after fires and runs perfect. thank you