RoninC5

Hi All-

Ok, so I picked up a 99 coupe 39K miles, (auto) great shape etc. etc. Ran great and pulled well-nothing wrong with the motor. However at WOT (or close) the rev limiter kicked in. It would not shift. Seller took to Dealer. Dealer checks a bunch of stuff and nothing amiss. Then he re flashes and viola! the problem disappeared. (Last owner had it 10 years and never touched it)

Have not done a ton of miles yet but feels like she lost some punch too.

Question:

1. With a K&N CAI and Borla exhaust (already installed when purchased) do I NEED a tune? i.e. to achieve max hp, eliminate a possible fuel rich scenario, health of vehicle etc.??
2. Anyone know someone who is good with this stuff (diagnostics/adjustments) in N. Colorado?

Thanks.. I have read a bunch on here but there are varying opinions so I thought I would ask my own question...All/any advice welcome!

RoninC5

I'm getting great responses on the local forum.. thanks though

tblu92

Sounds like someone at some point altered the shift points at WOT or you have rear tires that are not the same height as stock--this would make it not shift at WOT and hit the safety rev limiter----
A CAI and catback exh are not major mods but they do take some learning of the ECM to correct the fuel trims---Normally it only takes about 50-75 miles of normal driving for the fuel to learn out---Typically those mods will make the eng produce more airflow---So at P/T the engine will be lean but at WOT it will be rich and lazy---
If you have already driven it over 75 miles and it still seems lazy then YES I would deff. get a tune---