One reason...Cobra MAF is 120 bux brand new from any local Parts store compared to 240 bux from Nissan for the TTZ one. Mike Jez 93 SE-R with a BBird DET and NISMO 555cc injectors with TTZ MAF- back in the day 01 Maxima ZEX NOS, all bolt ons, 5spd, 310WHP 12.9 in the 1/4.