DIY Exhaust Mod – Gain of 10+ HP!!!

[tamarsha]

I have an 03 S with a BNC filter, secondary cats removed, 200 cell primary cats, and FVD software and I love still love my exhaust mod. Go far it! It is a cheap (free) easy mod.

[tuneme]

Ok got a drill and did it, but i only drilled one hole as its already noisey without cats..
and all i can say is WOW sounds close to a GT3, incredible gonna take it for a drive and see how she go's otherwise i recommend this mod highly!!!

ps. il try take a video

[tuneme]

im even considering drilling a 2nd hole, but im scared about back pressure problems
iv booked the car for dyno, so ill see whats what hopefully there some gains

[dja1980]

Oooh... definitely let us know the results of the dyno!

[crios]

I get a BIG smile everytime I see someone do this mod!

[tuneme]

Ok drilled 2nd hole and reset the ECU to re-learn as my tuner said.. and WOW IT IS JUST INCREDIBLE!! dyno tomorrow morning as its a public holiday today

let you know how it go's

[carguy]

So who's gonna make the before and after videos?? Outside car and inside car..

[tuanle16]

i am having the same problem as some others. can't get the angle because of the welded tip. the bit just slides down the pipe. any other suggestions. also, looking at the original picture...am i suppose to drill through two pipes? ie.obviously, drill a hole into the last out going pipe, but then does that hole just enter into the chamber? or is it suppose to enter the entering pipe? refer to the original picture. the "bypass" as outline on the picture with green arrow, shows pipe1 to pipe2. thanks. is there a specific drill bit i should buy? i bought one that was extra long and "masonite" bit, but it didn't work.

[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!

[greenerob]

Originally Posted by tuanle16

i am having the same problem as some others. can't get the angle because of the welded tip. the bit just slides down the pipe. any other suggestions. also, looking at the original picture...am i suppose to drill through two pipes? ie.obviously, drill a hole into the last out going pipe, but then does that hole just enter into the chamber? or is it suppose to enter the entering pipe? refer to the original picture. the "bypass" as outline on the picture with green arrow, shows pipe1 to pipe2. thanks. is there a specific drill bit i should buy? i bought one that was extra long and "masonite" bit, but it didn't work.

tuanle,

Please read my post that was posted just before yours. Follow my EXACT description and you will have no problem.
Also, you are not drilling into cement, so ditch the masonry bit and get a bit made for metal!!

[tuanle16]

greenerob,

thanks. when i posted, i didn't see yours. sorry. newbie. as for the bit, couldn't find it at home depot. that was the only one that was long enough. i'll try a different home depot. not much selection at local one. were you able to drill with cordless drill or did you have to get a corded drill? electric ones have more power right? also, instead of crios recommendation of drilling towards midline, you punch your hole away from midline, right? will try again.