I had an urge for my cars to go faster and more power for many years until I finally decided to supercharge my GMH Clubsport. It had a 5.7l LS1 chev in it that already put out 340Hp.

Well I spent the dollars to get the job done, and then found that I needed an intercooler because the air charge was getting too hot, then I had fuel mixture problems and it was running way too lean, then I was getting detonation something bad.

All this for 500Hp that the first time I planted the right foot gave me so much axle tramp that it bogged down and then laid a HUGE trail of rubber. All very nice if you are a lair but not very driveable in real life.

AS suggeted elsewhere here, I went and bought another vehicle to satisfy my need for speed (a race car for the track) and took off the supercharger, sold it and the car.

I bought a 3.0 X5 that was more than enough for around town but a bit slow out on the open road when overtaking that road train...... hence the 4.8.

Having gone through the expensive process, I can offer that once you start tampering with engines that are designed for one level, you usually find that other items (exhaust/fuel injectors/management/gearbox) all come in to question for the new power generated. Failures are expensive and tracing propblems time consuming.

Pay the money for a 4.8 if you want more Hp.

Cheers

__________________
PREVIOUS

2006 E53 X5 3.0D
2004 E53 X5 4.8is
2004 E53 X5 4.4 Sport
2011 E70 X5 3.0D with Aero kit
2009 E71 X6 50i Sport
2009 E70 X5 50i Sport
2007 E60 540 M Sport LCI (All time favourite car)
2007 E70 X5 4.8i Sport
2005 E53 4.8is
2003 E53 3.0 Sport