JC2GT3

I put SW bypass on my 997 GT3 after reading reviews from the regular posters here and on 6speed. Works great, sounds great and the SW guys were extremely helpful.

P.J.S.

That is what she said

Mooty -- I think Joe is talking about my guy in Seattle... I can vouch for him

this is what he built for me
http://www.youtube.com/watch?v=gOVcI7XkAyo

It was since quieted down a bit and ultimately a version of this (like the pic I sent you) will be on my RS

Please note, he is no longer with Advanced Street Performance... he was bought out and is now on his own.

Also RL'er 007DT now owns the car and can act as another reference check on the exhaust and the builder.

inverterman

I am in for a group buy. Good reviews, this is the real deal.

brim

I don't have numbers to back it up, but I didn't have any noticable reduction in low end torque when I switched from Sharky to RSS. If anything, I would say there is a bit more grunt with this system (but that is only subject to my butt).

In terms of resonance in the car. I have installed a switch to leave the exhaust open or closed as I choose. There is only a bit of resonance when the system is open and I am cruising right at 3000 rpm. 2800 no resonance, 3200 no resonance, full throttle - complete bliss!!! Note that when the exhaust is closed, you will have no resonance whatsoever.

wilson234

For all the by pass owners, is there any damage from not counteracting the increase in flow with fuel modifications? From my mc background you install an exhaust with meaningful performance improvements, you need to balance with more fuel. Otherwise, you will not benefit from the performance upgrade, have lean running conditions and overall driveability issues. Is the ECU on GT3/RS advanced enought to accomodate? I know installs like SW and RSS are also doing ECU modifications, but I'm also one to shy aware from this type of modification, both from a warranty perspective (bypass can be removed quickly for any service work) and potential smog (CA) problem.

Anyone can expand?

deputydog95

Subscribed.

4porsh

Just need a few more people signed on so the cost will be "cheaper" The exhaust guy makes these costume exhaust for 6GT3 and 7GT3s. With dyno pulls and papers to prove gains no losses.
I have talk with two 996GT3 and 997GT3RS owners that are repeat customers of this exhaust builder and have nothing but great things to say.
If anyone wants in on this please PM me.

Joe

malmasri

Here is one for you at 50%
https://rennlist.com/forums/for-sale...pass-pipe.html

brim

Someone with more of an engineering background is probably better suited to answer this question, but I'll give my pennies. I don't think the increase in airflow from removing the center muffler is great enough to drammatically increase the air/fuel ratio. There are no modifications on these kits to the air intake which is usually where you run into air/fuel issues. I don't feel the car is running lean, but that would require some analysis. There is certainly no censors going off.

911dev

I am not a tech either but will give my 2 cents. I also have an extensive mc background dating back to Mikuni flatslides and dialing in the fuel mixture when making changes to the exhaust extraction.

Anyway, the bypass doesn't add power -very, very little if any anyway- so I don't believe there is any increase in air flow. The oem center section was added for dB levels from my understanding. Even if more fuel was needed I believe that the ECU and fuel injection would manage that. I don't know if it's true but i have heard that disconnecting the battery does help the ECU adapt to changes; not that that would be needed in the case of a center bypass.

FFaust

Well also from MCs, the colour of the plugs should be an indication of mixture.

- White-ish, grey = lean, be carefull $$$
- Chocolate brown = perfect
- Black and sooty = too rich

But the ECU should be able to handle the small change involved here.

riverflyer

Went with the sharkwerks. Alex is always so kind and giving with advice and info and I know he puts the same energy into quality products.

CorrosionInhibitor

Hi Guys,

Just want to say first of all the SW muffler Bypass is a great quality product.

I`ve heard this on a 997 GT3 over here in the UK.

BUT what I`d like to say is...

I didnt choose the SW muffler bypass, I went the other route and purchased a EuroPipe Sports Exhaust for my 997 GT3RS.1.

Not only is it built to a standard that only Europipe and a few others including SW know how, the sound is just intoxicating.

I can honestly say everyone thats heard it comments on the sound, either at tick over, low revs when pulling away or on full chat when driving by. ALL GOOD BY THE WAY !

At a recent meet/track day in the UK a guy with a SW bypass and myself did some brivebys. Everyone that was looking/listening on was so positive on the Europipe and there comments we all in favour of the system as apposed to the SW.

Bottom line is everyones different.

The EP system is louder in all accounts than the SW bypass, but in the same token there is NO DRONE in cabin what so ever.

Also the help, support and advice from stef at Europipe is second to none, always on had to help, what ever the time.

This post was just to account that there is`nt just one favourable exhaust choice for the 997 GT3/RS.

911dev

I've been emailing Stef and getting more info on that exact system for my .2 gt3. From what I've learned from Stef and your feelings, I'm very excited about getting a Europipe Sport Exhaust too.

Do you run the straight pipe ends or the oem tips? Is the weight savings roughly < 30 lbs with either setup? (I would think that with the tips the EP system would be 3-4 lbs heavier than the their straight pipe end option; so maybe < 26 lbs than stock.)

TraqGear

If you guys can give me a couple of weeks, we are going to work on configuring a cup system to the RS and eliminate the two side mufflers. Should be a less expensive solution and Autometrics will offer them. I'm looking for a min of 35 lbs weight reduction and with no power loss (hopefully a tiny gain). They will dyno both ways the same day as well. I will let you know how it turns out. If it is good, Autometrics will offer a kit which will be very cost effective and hopefully achieve the weight reduction, better sound and at least maintain power. I love the sharky bypass, but eliminating just the center muffler doesn't offer enough weight reduction for the cost. (just my opinion) Also, the more aggressive track exhaust is too loud and eliminates all mufflers. (which I really want but won't pass sound and probably too loud on the street) I also like it because we are using almost all OEM Porsche parts. I'll keep you guys posted if you are interested.