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APR open carbon fiber intake installed in an Audi S3 engine bay
Latest Guide
Sep 8, 2026 13 min read

APR Intake Guide: Which Intake Fits Your VW or Audi, and What You Actually Gain

Which APR intake fits your GTI, Golf R, A3, S3, B9 S4 or S5, or RS3, and what it really adds on a turbo engine. APR's own flow...

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OneFastShop B58 catless downpipe, the cornerstone Stage 2 hardware for the M240i, M340i, 440i and Supra
Guide
Aug 4, 2026 17 min read

B58 Stage 1 vs Stage 2: Which Do You Need?

B58 stage 1 vs stage 2: what each map assumes, bootmod3 and MHD gains, the Gen 1 vs B58TU fuel limit, real parts costs, and what Supra and 540i owners report.

AWE AirGate carbon fiber intake for the Audi B9 S4, S5 and RS5 3.0T
Guide
Apr 2, 2026 13 min read

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...

Portimao Blue BMW M3 Competition G80 with the S58 engine, low front three quarter view
Guide
Jan 15, 2026 16 min read

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...