GM LS 4-Bolt 90mm Nitrous System (50-400HP) 4,5L Isuzu You can also use spacers

You can also use spacers that change the spacing of the bolts

Wesfil WA5270

It easily removes tar

4L L4 F/I - 160BHP 2009 - 2013 VOLKSWAGEN GOLF VI 1

and at the same time it produces an amazing sound effect - characteristic PSSSSSTT

GM LS 4-Bolt 90mm Nitrous System (50-400HP) 4,5L Isuzu You can also use spacers90mm 4 Bolt Throttle Body Intake Manifold Applications 50 to 400 WHP This Nitrous Express 4 Bolt Nitrous Plate System features a 90mm or 102mm billet nitrous plate that bolts between the throttle body and intake manifold making installation quick, easy and attractive. Both systems come as a single stage system and includes jetting for 50, 100, 150, 200, 250, 300, 350 and 400 horsepower. The plate is pre machined with a second set of nitrous and fuel