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early 997 cup exhaust on 997.1 gt3 street?


Old 01-16-2018, 12:22 AM
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Originally Posted by JCL59 View Post
991.1 cup from below w bolt on long exh tips. Will get some part #s incl the tips which are noticeably longer than 991.2 street version

Cool pic. Now it is so obvious as to why the 996 headers are such a restrictive design - Porsche obviously didn't have the width at the rear of the much narrower 996 to have a more centralized merger like we see above.
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Old 01-16-2018, 07:58 AM
Rickard 993 Turbo
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I also have 997,2 gt3 3,8 headers and side muffler if someone needs it
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Old 01-18-2018, 03:20 PM
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Default fit my early 997 cup exhaust on street 996 gt3?

i have installed my 997 cup exhaust on the 997 gt3 street - the gt3 street exhaust with the side adapters i reinstall on my 997 cup

what should i do with the early 997 cup exhaust - does this fit on my 996 gt3 street (with rear bumper from 996cup?)
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Old 02-21-2018, 02:08 PM
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Originally Posted by Yannick-HST View Post

The street 997.2 center muffler (steel version, not the RS Ti version) is exactly the one Porsche Motorsport uses on all 991.1 Cups. Works without issues... They just close the upper holes with the plugs I mentioned earlier. I‘m not exactly sure but I think it‘s even in the 991.2 Cup.

I also ran this very exact setup on a 997.2 GT3 without any issues for more then 45k km (lots of Track useage included).

Huh, mine, as well as many others, have had their stock steel 997.1 GT3 (non-RS)center muffler blow out after removing the side cans. I did use a valved by-pass, and therefore did not block off the top holes. Still had the stock cats/headers.

Mine blew out after 5k miles and 5 HPDE events. Now own a Dundon quiet lifetime muffler (around $3,000) -works well.

They tend to blow out on the rear along the seem - maybe it's seeing the increased pressure from the top pipe, not used on the cup cars.
Mine looked like this

Might want to pro-actively add a reinforcement like Fabspeed makes to prevent blow out with this solution, or have a local shop do it.


Last edited by orthofrancis; 02-21-2018 at 02:31 PM.
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