Blog
Guide
The Best Bolt-Ons for the Audi B9 S4/S5 3.0T
The B9 S4 and S5 3.0T gets most of its power from the tune, so we rank every bolt-on after it by what it actually does: intercooler, intake, charge pipes, exhaust and...
Guide
The B58 Bolt-On Build: What to Add and in What Order
The B58 bolt-on build order for the M240i, M340i, 440i, Z4 and Supra: plugs and Stage 1, a charge pipe on Gen 1 cars, catless downpipe and Stage 2, heat exchanger, then...
Guide
S58 Stage 1 vs Stage 2: Which Do You Need?
What separates Stage 1 from Stage 2 on the S58 in the G80 M3, G82 M4, G87 M2, X3 M and X4 M: what each bootmod3 and MHD map assumes, why the...
Guide
BMW Charge Pipe: Why the Plastic One Fails
The factory plastic charge pipe cracks on N54 and N55 BMWs, even untuned ones, and splits on the S55. Which engines need an aluminum pipe, which can skip it, the warning signs,...