I have an 89 gxl and I have dual ebay N1's on a catback made by a local shop. I just replaced my stock manifold/bonez racepipe combo with a racing beat header and presilencer combo, and I have a few questions.

1) My car doesnt shoot fire anymore... Well.. at least it doesnt Pop... How come?

2) The car feels slower in the top end... (Could be my imagination) but.. Could the 5/6 ports not me functioning anymore, from some kind of problem with the install? The AVC was removed and put back so I could get to all the bolts easier..

3) The car sounds great, Loud and deep... Untill about 4 grand.. Than it goes super rice and is raspy as all hell... Is that normal? It didnt do that with the racepipe. I can controll the raspyness.. like.. if I slowly bring it up to say 5 grand with about 1/4 throttle.. it stays deep. But.. If I floor it right off the bat.. Than its super raspy..

Any Ideas are welcome. What are some things I can do to troubleshoot this?

Im thinking something got messed up on the install, cuase this all doesnt sound normal. But, I douple checked everything any all seems fine.


Thanks

-Adam

 

I don't think it's the install. I installed an RB header last week also. I have an RP high flow cat and unknown brand n1 style mufflers. The exhaust sounds exactly like yours. Above 4k rpm's it becomes raspy and kinda metallic sounding. I am not liking the sound at all. The car does run better though. I notice it has more low end power and it revs up faster. Top end has not suffered, if anything maybe inproved a bit over the stock manifold. I have only taken it on a spirited run once since installed.. I still hit 110 in third gear.. so it seems to be fine.

 

Your top end probably didn't lose anything, it only feels that way because of the increase in the low/mid.