my crx when i got it would top around 140 mph then i changed my exhaust and now it tops at 110 mph could the exhaust be the reason? when it tops it doesnt hit redline in 5th gear it gets to about 7 grand and just stops and then goes back up to 7 and stops. i only changed the exhaust tip though not the entire exhaust so any thing you could think of for why it is topping at 110???