car dosnt have the right power

[frdyam400]

i have a 98 gtp, i was racing my buddies vr6 jetta, an i blew my heater core line, an my temp gauge pegged to the max, i got shut the car done rite away, drained the whole cooling system replaced the heater core line, the service engine light is on tho. an the car dosnt have near the power anymore, its dosnt knock or anything tho..... any help?? an what is the best cheap exhaust for a gtp??

 

[boostedcompg]

whats the ses light say? its trying to tell you whats wrong with it, listen

 

[Fivefingerdeathpunch]

got get the car scanned and see what the code is.

and stick with stock exhaust, thats the cheapest route. Because flowmasters and magnaflows suck and will drone like a *****.