Best Exhaust For Is 300?

[2004ManualIS300]

SRT makes more power than any other intake, but I'm not one to be messing with the ECU wiring. I've heard several horror stories about that messing up when not done exactly right.

Thanks Bartkat. I am with you, the "professionals" can solder it for me, and be responsible for any mishaps. I will talk to my local shop about it.

I was looking for other dyno results other than those claimed by the manufacturer.

As an aside, I will definitely post with any work I do. There are just not enough enthusiasts involved. I wonder how many people who bought the 1st gen IS knew of and were most attracted by, the I6 posi rear end combo.