[BiturboS4] APR bi-pipe install

California Fields cfields72 at hotmail.com
Thu Mar 6 15:36:32 EST 2003

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Has anyone installed the APR bi-pipe on their S4?  If so, is the installation
complicated and intensive (requiring the disassembly of lots of parts)? Or is
it relatively easy.

Thanks, Carter.

(sorry for all of the questions today).
Carter Fields, San Francisco
2001.5, GIAC-X, Miltek 3" cat-back, Strat. shifter, Strat. DVs, A-pillar boost
>From: Matt twentyV
>To: BiturboS4 at audifans.com
>Subject: [BiturboS4] V8 Tuning Potential
>Date: Fri, 31 Jan 2003 14:16:08 -0800 (PST)
>So we've had this debate now about whether the V8 S4
>could be tuned to 400hp. So I went to look at
>tuning options for BMW- which like the upcoming S4,
>uses highly tuned NA engines out the door.
>In a nutshell, forget it unless you add a
>For the E36 M3, you can find exhaust and chip
>combinations that have dyno data showing 10-15hp
>increases. There are also a few supercharger kits
>out there that advertise 80hp or so at 8psi.. $6k.
>For the E46, some tuners claim 7-8hp increase but
>don't show dyno graphs. I found one supercharger
>kit for the E46 330i
> For the E46 M3, there is
>some message board activity indicating AC Schnitzer
>is developing a system that will reach 400hp... for
>$13k!! I'm guessing that involves an entire rebuild
>to use new pistons to reduce the 11.5:1 CR. As
>someone already mentioned, adding boost to an engine
>at that high a CR is problematic.
>Matt Rooke
>'91cq- 20vt chipped
>'00S4- 30vtt stock
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