I have recently accuired a 1997 850 GLT Turbo and i am still trying to work out some mechanical problems but after that is taken care of i would like to put in some performance modifications. I am 17 and have about 700 to blow on parts and i dont know what would be best i have been looking a blow off valves and chip modifications but i have no idea what will give the most increase in speed. If anyone could give me some advice on anything that i can do to make my car faster that would be awesome, thanks.

 

I would spend my money on handling and suspension -- Bilstein shocks maybe, better tires, etc. A nimble car is more fun to drive than a fast one.

 

I would say go for either a computer or shocks and springs. If you get suspension and get lowering springs, make sure you get a shock designed for a lower spring height. I have the eibach pro springs and Bilstein HD shocks, which are performance shocks made for factory height. The car rides excellent until you hit a bump in the road. Then you are already in the damper and it will hit hard. If I swapped these out for a shorter shock it would ride better, but it's not bad enough for me to switch now. I also have the IPD computer which is very nice!!

 

Turbocharged engines love a free flowing exhaust system...

You can always buy an aftermarket exhaust at IPD
http://www.ipdusa.com/

Or have a neighborhood exhaust shop build one for you!!!

You can buy flanges here...
http://www.turbo-performance.com/Pro...ll_flanges.htm
http://www.hahnracecraft.com/hahn/parts/install.htm
http://www.roadraceengineering.com/f...andgaskets.htm

You can buy pre-bent mandrel bends here...
http://www.roadraceengineering.com/mandrelbends.htm
http://www.jcwhitney.com/webapp/wcs/...&storeId=10101
http://www.4customexhaust.com/components.htm
http://www.hedman.com/

You can buy high-flow cat convertor here...
Catco, CTO-6007
http://store.summitracing.com/partdetail.asp?part=18592
http://www.discountconverter.com/
http://www.randomtechnology.com/

IMHO, Mufflers that sound best with turbocharged engines...
http://www.flopro.com/FloPro.htm
http://www.precisionkelowna.com/exhaust-flopro.html
The Flo-Pro muffler has proven itself to beat the competition with a louvered pipe design, which accelerates the exhaust flow through the muffler. The louvers also give you a deep performance sound without the use of fiberglass that eventually blows out. The Flo-Pro mufflers are also designed to boost the horsepower generated from your vehicle.

Dynomax, WLK-17223
http://store.summitracing.com/partde...rt=WLK%2D17223

Borla
http://www.borla.com/welcome/

Hooker Aero Chamber
http://www.jegs.com/cgi-bin/ncommerc...60&prmenbr=361
http://store.summitracing.com/defaul...4922711+300044

Avoid mufflers designed for normally aspirated large displacement V8 engines...
http://www.flowmastermufflers.com/