Blog
Exhaust
Downpipe vs Cat-Back: Which Should You Buy First?
Downpipe or cat-back first on a turbo BMW, Audi, VW or Supra? A $199.99 B58 downpipe with a tune adds 30 to 40 hp; a cat-back is about sound. Here is the...
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...
Exhaust
B58 Catless Downpipe: Performance Gains, Sound, and Install Overview
B58 catless downpipe guide: 30 to 40 hp with a supporting tune on 93 octane, how it sounds and smells, install steps, fitment from M240i to Supra, and legality.