originalmotorhead

Curiocity got the best of me so I decided to remove that boat anchor of a muffler and make my own exhaust. After reading up on the various aftermarket systems and the fact that non of the muffler only systems offer any performance gain, I decided to tinker with making a system of my own. Earlier today, I finished all the mock up pieces and tack welded it all together and took it for a spin and I must say that it sounds awsome in the top RPM's. I'll post more pictures of the entire undercide once I get out to the garage and get the car on the lift again. Oh, and I still need to find some cool tips.(maybe)

Anyway, I was excited about this 'home grown' mod so I thought I would share with you all.

Tom
Columbus, Ohio

PaulStewart

Please put some tips on that, the way it looks now reminds me a VW Karman Ghia.

machina

lets see a pic from underneath.

originalmotorhead

Here's an undercarrage shot of the muffler delete system. I used standard exhaust tubung for this one and once I have it the way I like it, I will get some stainless bent and do the final version in stainless.(or maybe I could powdercoat this one). Learning as I go.

Driveability has been good so far, with the exception of a drone between 2 and 3 k, depending on how hard you are in the throttle and how much you have the motor lugged down. Higher RPM's sound awsome, more exotic than stock.

Tom

machina

nice, is that a crossover tube or just a support towards the outlets?

originalmotorhead

It's just a support, however, it would not be difficult to make one with a cross over tube.
That may be a good thing to try for #2 attempt. That may be the answer to some of the drone sound too.
So far I don't have much money invested, so making a few more is not a big deal.(more entertainment than anything)

Tom
Columbus, Ohio

NetManiac

Have you, or are you planning to get some dyno results? I'd be interested to see if there was any effect.

turbopop

That resonance seems to be a common complaint in many aftermarket mufflers, so I wasn't willing to part with that much cash for that potential problem.
So I took a different approach, and got the essentially the same result as you.
I got my hands on a cheap muffler off of an 'S', cut it open, and re-routed the plumbing inside to direct the flow of gases directly from the inlets to the outlets, (basically made it a straight-through, but I did leave a cross-over pipe in place so that there would be some wave cancellation, or so I thought.
Because I made all the cuts on the top, it looks like a stock muffler from the rear.
Just like yours, the sound is much beter than stock, but at cruise around the 2000-3000 rpm range where there is resonance or droning as you said.
I even re-opened it and provided a port inside where each side could open into a chamber, hoping that the expansion chamber would cancel some of the resonance. But it did not change anything.

strudel

I've cut open a couple of Boxster mufflers, one non S & one S. I cut out the 2 perforated inlet pipes. It's about 20-25% percent louder with no resonence thoughout the rev range.

Tool Pants

Where is Q when you need him.

JP-"S"

Who's exhaust and does it dyno any extra HP. If so do you have a graph and maybe prices?

originalmotorhead

I found these nice oval tips at Autozone for a whopping 5 bucks apeace. Whad you think ? I think they look pretty good, and it helped with the drone sound. I still have drone from 2k to 3k but not near as hars as with the bare pipes. I believe it is due to the tips extending past the bumper a 1/2 inch. And the tone is more mellow now too.

Tom
Columbus, Oh

PaulStewart

MUCH BETTER!

Moogle

thats not an exhaust, thats a pipe with a tip at the end

bet it sounds MEAN!!! !!! rock on!