I hate to break it to you but there is alot of aftermarket for your car. Your car has the beta engine, same as the first 2 generation tiburons and the i4 2003 Tiburon. CNK is selling a complete turbo kit for about $3000 with upgraded ecu, you can find out more information @ hyundaiaftermarket.com. KORE has a turbo manifold for a t3. The shop at HyundaiPerformance.com is constantly getting updates to the store. APEXi is coming out with a turbo kit for the Tiburon which would work on the Elantra. The Beta engine loves to be boosted. You could even use the 1g & 2g manifolds with just fixing one bolt if you are really cheap.

If you are looking for body kits, sharkracing.com has the most for any of the Hyundai cars. ElantaXD should also, or atleast tell you where to get some.

There is more aftermarket for your car than you think.