ATP Turbo 10mm (1.5 pitch) Nut Locking Head

Works great on Mazdaspeed!

Works great on Mazdaspeed!

These nuts were no trouble to install along with the studs, plus they're cheaper than the ones street unit sells for $45 which is nonsense, no more loose cp-e downpipe.

Work great cheap upgrade

These things made installing my BNR S3 a breeze instead of trying to reuse the stock bolts. They do require a 15mm wrench so if you have a tight manifold or downpipe they are slightly larger. They work with the stock manifold and Cobb downpipe with no problems. I've been running them about a week and no exhaust leaks and they stay tight.

locked on good and have not vibrated loose from the solid motor mounts yet

Worked perfect, locked on the studs perfect for an easy install, then threaded the rest of the way perfect. A+ made my DP install just a little easier. Thanks

Didn't work for me. Would not fit in a socket wrench at all. I mean at all. I know it was supposed to be a 14mm nut but the head was squished so much that it just would not fit any of my wrenches. The nut was more oblong/oval than squared. I bought them for turbo and downpipe studs for the MS3, which you know is already difficult to get leverage and access in the cramped quarters behind the engine. These bolts were just unusable for me. I didn't bother returning them since the shipping would have been more then the bolts cost. I'm sure they work great and it's just me and my problems. Maybe that's just the way locking nuts work and I'm in the wrong. Just something to consider.