A very popular mod to do to many cars. Same concept, I did this to my '02 Z06 but it was a little more invoved - as the stock exhaust is Titanium and the additional tube and wlding rod needed to be titanium. The resultant sound was quiet at cruise and incredible at WOT.

 

Must be cold in the garage, kitchen is better.

 

I bit the bullet as of last weekend...Used 1 5/8 hole saw...Very nice low rumble at idle and comes alive when you punch it...Great MOD!!!!

 

4 years ago I cut up my OEM exhaust with a specialist, completely drilled out the 2nd set of 400 Cell cats and replaced the first set of 200 cell cats with 100 race cats. I never had any cells and super boost but the sound was missing, so for the last 2 years I have been running a techart supersprint.

I am going to do this mod and put the original item back on again

thank you !!!!!!!!!!!!!!!!

Richard

 

Rico any pics of your hole saw and is yours too loud now as it is probably the widest of anybody's mod ?

 

I'm leaning to the torch method.

 

sorry just realised I have a hole saw but its for wood and plastic, good thing here is whatever you drill out remains on the drill bit for removal

 

just go to a muffler shop.. pay them $10.00 and get it over with....
torch method............... alot cleaner...no pieces to worry about

 

Ok I'll get my local body shop to blow torch it, did you do the full 2.25 inch diameter hole (width of the exit pipe) and was he able to make it pretty round any pics please ??

 

Drilled a 1/4" pilot hole then used a 1" drill bit that was plenty long enough with the tips removed. Wound up with a nice oval approx 1" x 1 3/4". Plenty loud enough at 3/4 throtle and more, yet still quiet when crusing. Had two choices on the drill bit, Made in USA for $42.00 or off shore for $19.00. Cheap one worked fine for just 2 holes. Good low dollar mod IMO.

 

i went with 2'... perfectly round..... ill try to take some pics for you.... looks the same as a drill just faster/cheaper/less worries in mho.

 

Awesome addition to the TJW thread. I am at month 3 or so now, no issues....and I just love the sound. I bought some ebay tips (dual)....

Hope everyone else is having success. I am at about 2.25" in diameter (see my photos)..... 1" seems to be much more quiet...perhaps the way for cabriolets to go if adventurous.

Hope everyone is going well. Clearly, there are a lot of ways to get this done. All seem to work out well.

JCB

 

This is going to sound odd, but....

Who has the biggest holes here? How big is too big? Is there such a thing as too big?

I had originally drilled a hole in each side that was the size of a #9 Unibit (1 5/8ths", I think). It sounded great and seemed like it added some power.

Yesterday I drilled a second hole on each size, with the two holes connecting, creating somewhat of a figure eight on each side. The car got louder again, but I'm not sure if it gained anything.

Any thoughts anyone? Did I go too far?

 

I dropped the oval that I cut out inside the muffler. I was going to finish drilling and the peice fell of and I haven't been able to get it out. Any suggestions. I have tried putting tape on a coat hangar and haven't been able to get it to stick. I also beleive it may be hard to find the piece now that I have driven the car with this condition. There doesn't seem to be any kind of rattle from the piece. I feel like an idiot for making such a juvenile mistake. All suggestion are appreciated.

 

I would guess expanding the hole size beyond the width of each tail pipe @ 2.25" doesn't add a whole lot