For you '09 XFR owners, RSC is offering a performance package for around $4200 that they claim increases HP by 60. Package includes exhaust system, pulley and and ECU upgrade. Not sure how this compares to what else is available though.

http://www.vividracing.com/catalog/r...ros8vdqndej0i7

 

Seems to be the only ones with a kit like this. Wouldn't mind doing just the exhaust only.

 

As somebody who had first-hand experience with vivid racing here in AZ, I wouldn't even think of getting this through them. I'm sure you know they're just drop-shipping it to the end-user and you can forget about customer service once you pay for it.....just my opinion.

 

They are not offering anything new or special. The 2009 XF is a 4.2 with the same Eaton M112 supercharger, so it is the same pulley that has been around for a while. The exhaust is the rear boxes only so all you will get is noise. The ECU tune is the same one Eurotek has been doing on the 4.2 cars for quite a few years now. If someone wants to increase the power on a 4.2 XF supercharged go for the Snakebite kit, & before the dyno questions start, no matter what the power increase is claimed to be you will see a marked improovement in performance. The XFR which is a 5.0 & has the TVS supercharger can't be upgraded with a Snakebite as the blower is driven with gears both front & rear. You can only replace the pulley for app 1.5 psi increase.