Through much pushing and prodding by Lexus forum members, a few companies have started turning out IS-F parts, and the car is responding very well to them. I was surprised at how well, to be honest. Typically, the IS-F is putting down 330-340HP and 295-305TQ to the wheels on a dyno jet..so about 20% drivetrain loss through an auto which is about right.
The first mod (which I also have on my IS350) is the K&N Typhoon intake. I was surprised to see the IS-F putting up numbers that matched K&N's claims. 25HP and 7 TQ to the wheel!! Not too shabby at all for a short ram intake and 30 minutes time.
Next to be addressed was the exhaust. There were so few available that a guy from the forum started his own company just to address the lack of quality exhausts. The JoeZ exhaust is VERY nice, all stainless and weighs about 7 lbs less than the stocker. You can see the quality and the restriction in the OEM vs. JoeZ below.
And the piece de resistance, the Sikky headers! Again..another part driven by asking (begging?) a manufacturer to make an IS-F specific part. And Sikky resopnded with their $1300 coated headers. To top it off, a set of Random Tech high flow cats keeps it all legal. (PPE makes headers for my IS350 BTW.
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Now I expected some decent numbers as I was following this bolt-on thread, but I honestly I didn't think it would respond the way it did. With intake, headers and exhaust, the usual first mods, the IS-F belted out a VERY impressive 420.8 HP and 352 TQ! Others have done this mods and got ~416 HP and ~350TQ, well withing spec, and again quite impressive for bolt ons. This puts the IS-F knocking on the door of 500HP at the flywheel which is mighty impressive considering no ECU flash or anything. I have to say..I'd LOVE to be driving around in an IS-F equipped with those bolt on parts!!
