You can always tune your exhaust to your personal liking here:

https://www.youtube.com/watch?v=xjZeul6iuiM

Just sayin'.............;)

TO

as long as you are not injecting fresh air into the exhaust system to dilute the exhaust gases you should be OK. All this mod does is bypass part of the muffler

Haven't laughed that hard in a long time.... thanks for sharing, now I know what to do when I feel depressed :cheers:

I did it, sounds better, but drone I got is making me look for other options.

Sounds better, but slight drone.

Hayward & Scott exhaust modification
 

For those in the UK that feel the factory standard exhaust is a little too subdued, Hayward and Scott do a superb "bypass" modification which replicates the factory switchable sports exhaust tone -

Porsche 996 and 987 Boxster Stainless Steel Exhausts - Hayward and Scott

You can either drive your car to them and have your existing backbox modified or send them another backbox (like I did) and they mod. it and send it back in a few days ready to be fitted. That way you get to keep the original just in case you or the next owner don't like the finished result! The sound is gorgeous, rich and rumbly but no resonance or droning at cruising speeds. Really reasonable cost as well compared to other sports exhaust options.

Carried out this mod yesterday and took her for a blast this morning, can't say the exhaust is much louder but there's definately a frequency change, noticeably below 3000 rpm, almost BMW note to the exhaust, especially a 3L beemer..... went to 13mm diameter on both sides with no drone and the ocassional blip and fart on overrun......what a ******************** to get the tailpipe bolt off from underneath...... she's a 2.7 so not welded on...pretty pleased overall :)

You're pleased you made your Porsche sound like a Beemer? Isn't that a step backwards?

He's working his way up (or down) to the exhaust note of a HOnda Civic with the tomato can muffler, lol.:barf:

Hilarious.....my M3 had the same exhaust note, quite deep.....nothing like a rice rocket......but thanks for your comments all the same chaps:rolleyes:

This is a great mod. Sounds great and no drawbacks.

Don't take it personal, Skoosh. ;)

I finally got out the extra-long drill bits and gave it a try. I went with 3/8" holes (9mm) because that is the largest reamer size I have.

The effect is subtle but pleasant. I can now hear some engine noise over the whine of the belts and transmission, but it's nothing the neighbors are going to complain about, or even notice. I'd say I got 10dp (dogpower) increase, max. Maybe.

Box muffler reconstruction
 

I was wandering if the "angle" of the hole makes a difference in the sound. Such as bending the lip nearest the rear inward to catch more exhaust. Thought maybe that would help a smaller hole (avoid the drone) pick up more exhaust consequently more sound? Anyone tried it??

I have drilled a one inch hole in both sides and have NO hint of a drone.

I drilled used a .50 bit and then opened it up a bit more to around .75 inches.
Sounds great I don't know about the HP but it leaves things "stock" visually for the CA smog test.

Only difference I notice is below 3k rpms and it's a drone. I'm not personally a fan of this mod, but gave me something to do this afternoon.

OK champ.. sorry to get here this late in the game of frustration. i have a non- S 1999. in the case of my muffler, the reason you were NOT getting a difference in sound is because the CHAMBER is already OPEN to the front and outside, right between the 2 exhausting pipes....so you are not making a difference by drilling again, UNLESS the drilling was significantly larger than suggested by CRIOS...(my new hero BTW). Don't have pics, again, at least in my case, that is what i found. the CENTER chamber is NOT sealed as in the case of the pics shown by CRIOS.

Here's my sound check.

https://www.youtube.com/watch?v=6Zqx5l-cOoY

Dzl210, that sounds good -- sporty but not obnoxiously loud. What size holes did you make?

I did this to my car today, except I used too long of a drill bit and went all the way through the muffler.

Actually sounds pretty good lol