Originally Posted by Zsteve

look in the general discusiion area, a guy there did a before and after dyno with K&N drop ins. Got about 4-5 hp gains at different rpms but no loses. So for $100 bucks you cant go wrong as you will also get better throttle response. Also if you get a CBE and do the UpRev tune later, the tune will probably figure in the different intake airflow (and exhuast too) and do even better. Id love to see a before dyno on a stock car then a dyno on the stock car with only the K&Ns with a UpRev tune (tuned for only the new filters) to see if the tune would improve the intake even more.