BLOX Bolt-on adjustable fuel cap regulators fits 88-00 Civic/CRX, 00+ S2000, 90-01 Integra, 91-00 NSX and it is CNC machined 6061-T6 billet aluminum case, and it allows pressure adjustments from 25 to 60 psi. BLOX liquid filled fuel pressure gauge construction keeps the needle steady, which is extremely critical during engine operation. Having the proper fuel pressure during extreme racing conditions is the key to engine longevity and maximum performance.