Exhaust Bypass Valves

[John V]

Originally Posted by boggtown

But how will I do that while driving next to a fart can honda and blow them away with my awesome sounding engine? I want a louder exhaust like 98% of this forum, by getting bypass valves, I can get loudness, mediumness, or quiet instantly and keep the woman happy or open the valves as soon as she gets out of the car so I can scare small children.

The only problem is that it doesn't really sound good when the muffler is off. It's just boomy and obnoxious. Given that there is no performance increase at all to running straightpipes (with the possible exception that with real straightpipes you can eliminate the weight of the muffler) it doesn't seem worth it. But, your car.. knock yourself out!

[djomlas]

so you want your car to sound louder than a fartcan on a honda? am i getting this right? and y are you even trying to impress honda boys anyways...they already got it bad
there is a difference b/w a nice sounding exhaust that is pleasant to listen to, and annoyingly loud.

[John V]

This is true. And I can tell you from experience that a Boxster with no muffler sounds absolutely terrible. When I was building my custom exhaust I tried it. Not good.

It wont be 100% without a muffler, there will always be flow through both pipes, just more through the valve. If it does suck then I can just open it a little bit like the PSE bypass.

[David_J]

When I took my car in to get the exhaust installed, I removed the 2nd cats prior to dropping it off. OMG, is was crazy loud. Did not sound good at all. Having the valve that you can adjust should make it sound better as you can control the flow. Since there was no backpressure, the car drove poorly. That was the worst 5 minute drive I have ever had in my Boxster.

Ferraris use this valve type technology. The sound of the valves slamming shut sounds kind of cool. Like a shotgun! You can hear this on FabSpeed's web site in the Ferrari section.

[noone986s]

I have been looking at ordering one of these

http://cgi.ebay.co.uk/Porsche-Boxster986S-3-2-986-Sport-Sound-Muffler-Exhaust_W0QQitemZ290056062535QQihZ019QQcategoryZ38 786QQcmdZViewItem

Might be a different way of installing the valve in the bypass pipe. The video shows what effect the bypass has.