Yes the stock mod was pretty average to say the least and it actually droned which forced me to look at an aftermarket one.

My Kline is fabulous, in the past 6 or so months it has become much louder in a positive way.

 

Well, it's on!

I think it does exactly what I want it to do.

I can really hear the turbo's at WOT, it makes more power (I think...), and I love the cold start :-)

 

the cool thing is you did it yourself and it cost ya nothing to try. rep pts for that!
my modded stockers takin up space in the garage lol.

jim if the kline gets any louder now? i'm right at the limit of where folks look at you while parking etc. ( not necessary lol )

 

If it does, just put the cats back in. But then again you'll be sacrificing the extra HP you say that you have gained.

 

Hi, i know this post has been going on for years but I'm wondering if anyone knows if the same mod (drilling into mufflers) works for non TT cars? Seems like the entire discussion has been a turbo mod discussion? thanks for helping a newbie!

 

Negative- this is a Turbo muffler mod only. There are other hacks for non turbo mufflers however. I think it something like gundo-hack or something like that.

 

that's what i thought and yes, familiar with Gundo and Fister, looks like I'm going that way. thanks so much for the reply!

 

I know im kinda late to this DIY mod, but having completed it today I feel like I can contribute here.. this thread has a name, now it has a face.... here is my selfie with the two pucks I cut out today with a few 2" holes saws on my face. only ran the car for a minute on the jackstands & the improved idle sound is promising... will drive it in anger some tomorrow...

 

Ancient thread bump!

Has anyone just gutted both cat's and nothing else? Drone?

Thanks!

 

I did it, zero drone - car picked up 8-10bhp.

 

Hello everyone, I am going to make this modification in my 996 TT, but I want to know which is the best hole diameter: 1 "1/3 - 1" 1/2 - 2 "... to get the best sound without losing that increase of 10-15 hp and 20-30 nm torque.

Thank you

 

Not sure it matters. I believe my hole saw was 1 1/4”. Sounds better, no drone.

 

Jeez, buy a muffler, don't put holes in the OE can.

 

I think you're in the wrong thread, this is to make the hole in the OEM exhaust.

 

Yes, I'm advising against it. Search ebay, there's cheap exhaust out there. Even those china made pipes are better than this idea. But if you must, use a stepped bit. That has all the size you need.