You can put the 1.8 liter cam from the Elantra in there for a little more power, or you can go through the after market.... These guy's...
http://www.hve.com.au/
http://hdkautosport.com/Merchant2/merchant.mv?Screen=CTGY&Store_Code=HA&Category_Code=UTH
NOS!...I Need NOS!....And I Need It By Tonight...