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Didn't know they sold them, they are only listed under 90-91 GT 928 on this website. I would imagine they will fit any, what about OB's? In searching for headers on here I never saw mention of them so I thought I would share. http://www.car-stuff.com/store/?N=11...698+11920+9215
They are only 1 5/8" primaries but unless you are over 300rwhp generally that is enough. Pretty darn cheap too at 340 buck coated and everything... I seeem to remember on, and i realize this is a completely different car, ls1 cars shorties dont do a whole hell of a lot, sometimes practically nothing. Is this even worth bothering? How bad are stock manifolds? I have an 86 btw.
BTW by retrofit to the s3, will it plop right in or take some other means to make them work like the earlier cars?
The S4 manifolds have three bolts per exhaust port vs. two for 16V/S3. I think you have to cut the extra bolt hole boss off, and IIRC, some other small fixes to fit the S3.
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission? George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
The stock 85-86 SS manifolds are pretty good. They could be better made for flow, and with a bit larger ID, I think they (shorty headers) could make nearly as much power as full length headers, without the clearance issues.
(The 16V cast iron manifolds are heavy, but with a little porting flow quite well.)
It was like 10hp. I got as much gain with the straight pipes, but it was additive.
the equal lengh headers gave me another 10hp.
However, on the holbert car we did 292rwhp and it jumped to 334rwhp with the equal length headers, tune up, coding plug, air box mod, straight through exhaust, and new ignition parts.
mk
Originally Posted by Formula94lt1
Whats the power gain from full length headers like msds on a stock car?
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