Problem is, the NISMO Adj. FPR DOES NOT fit the stock rail...it will bolt on, but hits the head!
It was made for the SR rail, which has the FPR at a different angle.
You have 2 options:
1) Make a bracket to hold it in place...it seals with an o-ring, so it can sit anyway you like...but you need to bolt it in place so that fuel pressure does not pop it out of the rail.
2) Get an universal 1:1 ratio adj. FPR...and use an adapter like so:
http://www.store.yahoo.com/pha....html
- Brian