DIY Exhaust Mod – Gain of 10+ HP!!!

[Boxtaboy]

FWIW, someone did this to their 02S at a local Boxster work on cars day (drilled 2 holes with a long drill bit), and afterwards, I could hear no difference. You sure it's not all in your mind?

[jazzhound]

Originally Posted by Boxtaboy

FWIW, someone did this to their 02S at a local Boxster work on cars day (drilled 2 holes with a long drill bit), and afterwards, I could hear no difference. You sure it's not all in your mind?

I notice a difference although sutle. feels like I gained a few hps also!

[Boxtaboy]

Originally Posted by jazzhound

I notice a difference although sutle. feels like I gained a few hps also!

Must be the brake bleed! Glad to hear you noticed a difference. Will have to get Gundo to drill bigger holes next time!

[SoK]

yeah i don't know how you guys are doing this on the welded tip models, i'm just tearing up the tip now.

Tried punching a small hole to start, can't seem to get it with a long flat-head or an actual punch at the end of a long file I have. any other suggestions?


edit: got it, just used the large flat head screwdriver and a hammer and punched out a 7/8" x 3/8" rectangle. Couldn't get anywhere with a drill. Took about 15 minutes once I figured out the technique. Haven't started it up, we'll see how it sounds tomorrow, if I can notice a difference.

edit: There is a slight difference in noise level, but i do like it. It's really pretty tough to notice, which is good. no drone whatsoever.

just a note, don't forget to take the tape off the exhaust tip before you leave for the day...

[mcfly777]

I tried to do it over the weekend, but just couldn't. Tried first with the drill, but it wouldn't catch. Also tried with a flat screwdriver, no good, it just keeps dancing around...

Don't know what to do next.

mcfly.

[desmoman888]

Done the job in ten minutes flat....4 by 10m/m holes in my welded oval exhaust system....the sound is now spot on....thanks for the info guys....not sure about the 10 hp gain !!!!!!!!!!!

[tuanle16]

desmo...

what was the key? i tried several times and failed. i was able to get a screw driver in on one side, but that was it. so just a small tiny hole the size of a screw driver. and as you guessed, no sound difference.