Thread: Meth Kit
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      04-29-2012, 07:51 PM   #6
pbonsalb
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Drives: 08 E90 M3, 99 E36 M3 Turbo
Join Date: Feb 2011
Location: Concord, NH

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Biggest bang for the buck is a catless x-pipe if you can find a used one for under $1000. Get one with resonators unless you are young and trying to attract attention.

A used pulley is also good bang for the buck. As is a drop in air filter.

Tunes add refinement and give you some options like a higher redline or a coldstart delete or a rear 02 readiness fix for catless operation, but don't add dramatic power. Typically, they add upper rpm power, in the range of 10 rwhp.

The only exception seems to be the meth tune that allows timing to be increased at lower rpm. It adds power across the rpm range and more than a non-meth tune. I think it has the potential to add 20 rwhp. The downside is that it costs twice as much as a non-meth tune.