What would cause noticable power loss in a other wise stock 6Gt3? My friend & I both have 04 Gt3's, one w/ 10k odo & the other 30k odo. both cars are bone stock, yet the 10k car is vastly more power than the other! Would bad cats cause a loss of power or could it be something else?

 

"Safe" mode, cats, MAF, clogged intake/airbox, etc.

 

Crawl under the car with a rubber hammer and give your cats a tap.

 

Seems like a remote possibility, but here: https://rennlist.com/forums/996-gt2-...-power-go.html

 

Thanx! We'll give it a shot!

 

+1 Try cleaning your MAF. It wouldn't cause a large power loss but I noticed a difference after I cleaned mine.