Hi All:

Nowadays many cars have more than 300 horses. I feel my GS4 is under-powered. I would like to add at least 50 ~ 100 horsepower on on GS4, any comments?

Turbo? Supercharge? Who makes them? Thanks in advance.

 

SuperCharger from SRT.

www.swiftracing.com

this should solve your trouble

 

the supercharger from SRT is the most amount of horse power you can get but if cant afford it then you can go with the SRT HIFI/ECU II and the torque converter and an exaust system you will be putting out about 340hp and 355lbs of torque but the torque converter alone will supposedly drop your 0-60 time by 0.2-0.5 sec. and the 1/4 mile times by 0.5-0.7 secs. so definetly worth the money IMO