Mikke_Possu

Hi,
Like title says, does 993 headers fit to the 964 without any modification?

I have thinking to buy these headers and use custom made muffler.

http://www.fvd.de/de/en/Porsche-0/99...eating%29.html

Thank you.

Geoffrey

The exhaust manifold / heat exchangers from a 993 do not directly fit a 964. The flanges are oriented 180 degrees differently on one side. If you had 993 cylinder heads, or 9M heads that have all 4 corners drilled for exhaust studs, then they would bolt straight on. You can have a company cut the flanges off and rotate them 180 degrees, but it requires a jig to ensure they are welded properly.

Bill Verburg

here' is a set of 993 headers which have had the right(left in pic) side flanges flipped 90* to fit 911 or 964 head bolts


here's a set of stock ones ,again the right(right in pic too) side flanges are 90* off from previous


993 heads are set up for either orientation
993 head




964 and older heads are only set up for a single stud pattern



the exception is 964 RS3.8 which used 993 type headers and head exhaust stud pattern
964RS 3.8 type head

SuperUser

Bill,

You have great pictures of every Porsche part!

Mikke_Possu

Thanks Geoffrey and Bill for fast and clear answer.

RacinToday

Bill: Now that is what I call an answer and graphic example. Nicely done.

PChar

Sorry to resurect this old tread, but I am very interested in fitting a set of 993 headers to my 964. Based on what was said above,.. can one easily fit 993 heads to a 964,..???

Thanks

Laker

PChar, have you seen this CL posting (no affiliation)

race911

"May or may not work with the stock cats and mufflers.............." There's an understatement, given stock 964 exhaust routing versus any 911 header system I can think of.

PChar

I did emailed this clown a while back,.. and he sent me an exact photo of the fabspeed headers exhaust system. This may be a scam or someone looking to make a quick buck...

Laker

OK just throwing it out there.

Bill Verburg

Yes, easy but not inexpensive. You need the heads, cam carriers, cams etc. It's worth some hp due to the bigger valves.

The 993Cups were built on 964 bottom ends w/ 993 top ends

PChar

Thanks Bill, you have quite of an extensive expertise over exhausts and brakes as well from what I have been reading. Do you have experience or have heard anything about the Steve Timmins 993 HE with flipped flange for the 964? If so could you provide input? I have exchaged emails with Steve a while back about his system which would use his Craby Muffler as well, he was supposed to send me a sound bite of his system. I know he is a busy guy, and may have not got around to doing it, but I am very curious of how this set up perform on a 964.
Thanks

Stephane

tacomaworld

I have a 964 with an aftermarket exhaust that sounds great.

I just bought a 993 that has motorsport option but does not make enough noise.

From what I gather, the studs have to be offset 90 degrees when trying to apply a 993 exhaust to a 964. But going from a 964 to a 993 ought to be a direct fit. Right?

HiWind

Bill thanks for the pics