use a k&n with stock intake. my 2001 (112,000 mi) gets 27 mpg in town, 30 hwy. mobil1 5000 & lucas.
AEM Bruteforce.
Purchase an AEM cool air intake
I did not install an AEM cold air intake into a 2005 Jetta GLi.
about 2 wheel horsepower
Install a AEM air intake.
Ambient air temp sensor
AEM cold air intake valve can be purchased through many different automotive part suppliers. Automotive part suppliers such as Auto Zone sell these types of items, and if they don't have it in their stock, it can be ordered. eBay Motors should yield for result for this part when using this resource.
idk exact specifics, but after installing mine there is a definite notice in increased hp. i strongly suggest the cold air intake.
The first mod I made to my 2003 Tib Gt was the addition of a AEM cold air intake. Before doing any mods, the Tib was put on the dyno, and WHP was 163. BHP for the V6 is 172 per Hyundai. After install, we recorded 175 WHP. The throttle response was much better with the new intake.
Honda engines are already built pretty well. The air intakes do flow pretty good nowadays. I have seen AEM intakes on a stock si engine make from 3-5hp. You can get a few more if you do exhaust on it at the same time. For maybe a total of 8-10hp. Hope this answers your question.
Just a few, probably 6-8 hp
AEM cold air intake, PACESETTER header, electric cooling fan swap, JET computer module