slow 01 ACR ???

[99t1]

April 01 ran 410 hp bone stock 2k miles on 01 ACR.
September 01 ran 411 hp with Borla cat back and straight pipes. This car is down on power. Apparently I should be @420. Could straight pipes coming from the Borlas be giving "to little" back pressure causing no gain over the stock exhause system? I thought the Borla system was good for @ 9-12hp???

what's up?

 

[PMUM]

Welcome to the wonderful, creamy world of an '01 ACR.

 

[THEMASH]

You need to run your car for about 300 to 400miles, then try to redyno it. same thing happened to me, i dynod 406 stock, 411 with Belanger Headers and exhaust right after the install, then i drove my car for a while, redynod at 435RWHP. go here: http://vca1.viperclub.org/ubb/Forum7/HTML/000237.html
for more info and to view dyno results.
Good luck