First off, a bump for this awesome mod!
And in almost every exhaust/intake mod discussion, I hear at least one person say "I wish I could hear them side-by-side!" Well, today I got my chance! A fellow identical 2003 Boxster S owner brought hers to my office and we parked them side by side for a little comparison.
I've got mine drilled with one hole per side with only a 3/8" bit and little bit of extra filing to ovalize the hole. Hers is completely stock. Definite improvement in low RPM sound in mine. Even with the relatively small drilled holes, it has a much lower, aggressive growl. Improved sound continues until the de-snorkeled intake sound takes over on mine.
I didn't realize how much of an improvement this minor mod actually made until I could hear them side-by-side! It doesn't take a lot of drilling to make an impact either. Well worth the 10 minutes!
And for grins, a picture of our test lab...
987
986
986
