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PCA Member since 1988
Join Date: Feb 2018
Location: SW Washington State
Posts: 4,646
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Well, you can get 20 HP with just the chip and 93 octane gas. Add the large diameter SSI's and a low restriction muffler to pick up a few more. More than that will require different shape and higher compression pistons, and cams.
Bottom end: Nothing you do there will add power, unless you increase the stroke by installing a longer stroke crank and rods. $$$$
Mr. Merk also said something that reminds me: Replace the lower head studs if they are Dilavar. Use the Porsche steel studs. You can use prettier and stronger aftermarket studs, but they do nothing to add HP. If you aren't racing, then the Porsche OE studs are more than adequate for the job.
It sounds like you are cost-conscious, so before you pull the engine, write down your objectives, then what it will take to get there, then what all that will cost. If you don't have broken head studs or some other reason to drop the engine, just put on the SSI and muffler and install the chip. Then drive it for awhile and see if you want more.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners.
Cars are for driving. If you want art, get something you can hang on the wall!
Last edited by PeteKz; 11-20-2025 at 11:44 PM..
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