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Cathafer, why did you only remove one cat? If I recall on the IS-F the exhaust is very similar to the IS350 in that it has 2 primary cats, 2 secondary cats and a large single resonator. Are you running stock mufflers? I'd love to check out a video clip if you have one.
I am working on this same mod on my IS350...Trying to find out what is the best option. Did you have a shop just make a "test pipe" or did you find something aftermarket?!?! (assume not) to replace that section?
Thanks for the info!
Your car is looking better and better every time I come over to visit!
I haven't verified yet, but from the looks of things, the battery and it's mounting are the same for the IS-F and the IS350/250's. I'm just about complete with the mini battery project that shaves 26.5lbs off the car.