Custom Exhaust

[Gary in BR]

Just go with straight pipes...

They sound amazing, they are loud!!

http://www.youtube.com/watch?v=M1VI-rTaUmU

This is a exhaust setup with the bypass pipes, have the guy who built that custom setup for you do this and change the tips to what you like.


http://www.youtube.com/watch?v=EEPv_l6GBfw



My favorite video with current setup.
This is me approaching from about 1.5 to 2 miles away.
You can hear the car at full throttle in the distance but i had to back off...i was hiting going way to fast for public roads.

There are a few other videos with the new set up in different situations.


http://www.youtube.com/watch?v=Pw9bRcdOj-Y


By the way right now the car has stock cats, aftermarket headers, muffler and a supercharger. There is another phase of mods that are more agressive than what i have now.

Have a great day,
gary

[Boxtaboy]

Originally Posted by Gary in BR

Just go with straight pipes...

gary

Gary, I don't doubt that the straight pipe set up sounds loud, but this guy specifically is looking to tone down the resonance/drone in his car, as it is driving him crazy. I doubt a straight pipe set up would help tone down the drone, no?

[spine911]

Magnaflows or most american brand mufflers=drone issue, plain and simple. Only way to turn it down is with Resonators(definitely wont work in most porsches bec. of the limited space) or replacing your mufflers.
IMO, the more highend european made mufflers are your best bet when you dont want the interior drone issue. I have a BRABUS exhaust with Resonator deleted in my MB E55 and there is absolutely NO drone even with the resonator delete mod.

[John V]

Originally Posted by spine911

Magnaflows or most american brand mufflers=drone issue, plain and simple. Only way to turn it down is with Resonators(definitely wont work in most porsches bec. of the limited space) or replacing your mufflers.
IMO, the more highend european made mufflers are your best bet when you dont want the interior drone issue. I have a BRABUS exhaust with Resonator deleted in my MB E55 and there is absolutely NO drone even with the resonator delete mod.

False.

It has nothing to do with the country of origin of the muffler. It has everything to do with the construction of the overall exhaust system. The factory system is extremely complex, with tuned chambers and absorptive materials to cancel specific frequencies. The cheap custom exhaust that a local shop can build you doesn't have these designed-in features, so in the case of a Boxster it will create unpleasant tones. Simple as that.

Fixing the problem is far more complex. But it has nothing to do with the mufflers being "Amiercan."

All I said was I saw where a person on a website with an aftermarket exhaust wrapped header tape (or some other varient) around the 2 mufflers. He said it helped. I would believe it due to the absorbing properties of the tape changing the resonant frequency of the metal. Do I know for a fact, no. But try it... you got nothing to loose but a couple bucks.

[Bisimoto]

Where,
Since you live in the same city as I do, and may not mind visiting my facility in Chino, feel free to stop on by, so that I can take a look at your system. I may have a solution for you.

I just made a custom prototype unit that does not have the problems you have encountered...nonetheless, I am curious to your DB level with the current setup. Let me know!

[Rodger]

Someone needs to design a long-tube Boxster exhaust that uses small muffler cans. Instead of entering the U-pipes and going straight into the muffler, the exhaust needs to be routed to the opposite side of the muffler. Example, the left bank's exhaust would enter the right side of the muffler and vice versa. This would effectively add length to the pipes and reduce or completely eliminate the droning. The two cross pipes could be routed directly behind the tips and the muffler cans could be about the size of a GHL exhaust's.

^^ Does that even make sense? It's late.

[Gary in BR]

Originally Posted by Boxtaboy

Gary, I don't doubt that the straight pipe set up sounds loud, but this guy specifically is looking to tone down the resonance/drone in his car, as it is driving him crazy. I doubt a straight pipe set up would help tone down the drone, no?

The straight pipes where so LOUD i did not hear any drone, or my, cell phone, myself thinking....

The straight pipes where tounge in cheek, the other two options where realistic options.

The current setup i have has no drone, its actully to quiet for my taste and i may be looking for a used GHL.

The setup with the bypass pipes sounded GREAT but my tips where not the most attractive.

BTW Boxtaboy..i did get you wink. I love sarcasm.

Have a great day

[Boxtaboy]

Originally Posted by Gary in BR

The straight pipes where so LOUD i did not hear any drone, or my, cell phone, myself thinking....

BTW Boxtaboy..i did get you wink. I love sarcasm.

Have a great day

"...so loud that you didn't hear any drone or yourself thinking." That is too funny.

I've actually driven a GT3 with straight pipes before, and the sound ROCKED. Problem was it rocked the entire street so much that the neighbors came out to yell at me. LOL

[djomlas]

the way i did my exhaust mod i dont have any drone in the cabin.
took it autocrossing this weekend with the guys, even more impressed and everyon gave me compliments on the sound.
plus it cost me under 50 bux
and i can close it, making it 100% stock sound wise, or open it partially.

[mcajic]

Gary,

I have 2001 2.7 986.
Since I don't care much for drone, I want to straight pipe my Boxster as you did. Do you know where I can get this done and how much this would cost me?
Thanks,

Mario