Rennen

Man, that's a nice growl coming out of of that engine now. It also seems to rev a little better. Nice mod for a small amount of $ and a little bit of time

joey bagadonuts

Congrats! Now pop into an enclosed parking structure (your local mall, perhaps) to get the full effect!

I was wondering if you also reset the DME chip? I always do that after any intake/exhaust change or, heck, even if the weather changes significantly. You blank out the current settings by uplugging the battery ground for 20 minutes. Now, reconnect, fire it up, let idle for a few minutes and then take off for a spirited 20-minute drive.

The goal is to force the engine management system to adapt to the change in exhaust flow, i.e. to make sure you get the most out of this mod.
Have fun!

Bill Gregory

If you just replaced the primary muffler, you're only getting part of the potential sound. Put some major holes in your airbox cover, and you'll get some sweet sounds under full throttle. There are some pictures on John Miles website here. Talk about a price performing mod!

Andy Roe

No everyone likes the drillled effect!! Sorry Bill! I'd remove the airbox cover & duct tape the filter inplace to see if you like the sound first! Also, it might be worth sourcing a used cover from a breakers yard before drilling yours!!

Andy

Bill Gregory

Andy,

Great idea to check out the sound prior to putting drill to cover.

Rennen

I know, I park in a parking garage at work and I can't wait to hear it in there.

I hadn't thought about resetting the computer. Sounds like a reasonable thing to do, though. I used to reset the ECU on my TT once in a while for the same reason.

Rennen

Sounds like good advice.

RSAErick

Sounds fun!

I'm curious about doing a muffler bypass myself. I've heard all of the talk about more hp, more torque, less of both...

But I'm still very curious about how the sound is different. I know that I need to just go find someone in my area that has done the mods to their 964, but until then... Did you listen to a secondary bypass before buying your primary byass? How do you compare the differences?

Thanks.

Erick

Rennen

I just posted a message here and paid attention to what people said about the sound. I went to Fabspeed's sight and listened to a few recordings and settled on the primary bypass for now. All I can say is do it. It's not loud, just way more throaty and has a growl where it sounded...well...muffled before. I definitely like it.

dirkie

Gentlemen,

Try the following ... Cupbypass, empty cat, original airfilter incl original (not drilled) airbox.
SUPERsound !!

Regards

Rennen

I hope I don't sound too dopey, but what do you mean by "empty cat"? Are you just talking about a cat bypass?

Gavin

To get the full effect, don't forget to change the tail pipe/trim to a stainless steel one (89mm with same angle cut), then it really does make some noise.....(and it looks good too).

I have had both primary and secondary bypass pipes fitted (with cat bypass), at different times (ie not at the same time) and would say that the secondary G-pipe gives a slightly softer/looser sound and the primary gives a harder edged sound. For volume I would say that they are about the same. I couldn't comment on any power differences as the engine is in a different state of tune to when it had the g-pipe fitted...

Rennen

Oddly enough I've been thinking about calling Fabspeed back and ordering their cat bypass and tail pipe.

AJKOK1

I Have a Cat bypass and Primary bypass and love the sound, I also changed the exhaust tip at the same time to a wider stainless one.

I had never thought about it before, but is the suggestion, that the original exhaust tip makes it quieter ? My main issue is keeping under the 105db limit for track days !!!

RSAErick

FYI...

Fabspeed has either the primary or secondary muffler bypass for $325. Performance Products has the primary bypass for $299, and the secondary bypass for $154 (a big savings!).

Maybe someone is aware of quality differences between the products, because I am not, but I thought that the price difference was worth mentioning.

Erick