where can I find a turbo or supercharger for a 2003 maxima 3.5 v6?

There's no kits available now for the 3.5. Stillen used to make a supercharger kit for the 6spd maximas but phased it out due to low/no customers and cost ($6500 kit!). I really don't see a distinct advantage slapping on force induction since the engine already makes 255hp (210-220 corrected). You can do some pretty simple things (intake, headers, full catback, AFR tune, IM spacers, Cams) and you can be in the 300hp (iirc 260whp) range easily. Mind you, doing all these are far more realiable and cost effective than slapping on boost and bombing the motor.

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where can I find a turbo or supercharger for a 2003 maxima 3.5 v6?

I have looked every where and I cannot seem to find a turbo kit or supercharger for the maxima's that have the 3.5v6 engine.Is there a reason why no one made one.Or is there a company that sell's them.I know I can do a custom turbo set up but I figured that if there was one already it be...

Supercharged Maxima

Supercharger and Turbochargers require custom tubing to allow increased air flow into the intake therefore you will be required to take off your cold air intake kit off to utilize either one. In my honest opinion, a cold air kit doesn't really do that much for your car performance wise and the only way to retain it and use a power adder would be nitrous. As for "double" charging your car you can definitely twin turbo it with a twin turbo kit but I haven't seen any twin supercharger setups on a v6 mustang. Not saying it can't be done, but both systems together would take a lot of room under the hood of your car and with either system you are going to want a proper way to cool that air before it enters the engine (a three core intercooler would be best.) The v6 mustang had the 3.8 pushrod motor in it until 2005 and their power and torque curve rise similar to the old 5.0 motors. It will have plenty of grunt down low but start running out of breath in the higher rpms. A centrifugal supercharger or turbocharger would compliment the v6's power band working best at mid and higher rpms to create boost and pick up the where the motor would normally fall off. Either way, you'll need much better engine parts to handle that kind of power not to mention drivetrain parts too. P.S. The 3.9 wasn't in the mustang until 2004.

sts has a universal kit

try ebay autos or try this link www.turbonetics.com