yea installed the E55 AIR INTAKE i bought on here ( thank you amx1397 for the good deal) and yea i had no idea it made that big of a difference.. and my rear wheels tell the seat of my pants this is a very good upgrade ..had to make new front air box brackets as the stock ones are shorter.... i already have the EC tune and that was a "WOW" it changed how the whole car drove and so farfor me the best bag for the buck for the car..also i did the resonator delete and may not have done munch for the HP but did a lot for the sound....my nexted upgrade will be the EC SC pulley as soon as they have all the bugs worked out.....