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Does anyone mod a 958 CTT?


Old 06-11-2018, 05:09 PM
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Does anyone mod a 958 CTT?

Long time lurker, first time post...Hello everyone

I currently own my second CTT. The first was a 2005 955, I owned it for 4 years, and it was the best German car I've had yet. I am a fairly recent owner to a 2011 958 CTT. Bought it from Porsche San Diego (awesome experience there, truly!) as a certified pre-owned Porsche. The unlimited mileage warranty for me is great, I commute nearly 100 miles a day, so I am racking up the miles. It's my daily, but I am ready to modify it and notice that there are not a lot of 958 builds. The mods need to be top of the line, tasteful, and deliver more power. I am not looking for aesthetics.

Why are these not modded as much as the 955 and 957? Especially the 957, as the engine is nearly identical. I am being cautious with the warranty aspect, and for now am only doing bolt-ons that should not affect my coverage. I have a great local Porsche dealer service department and I have worked for a BMW dealership service department for almost 20 years. I have a fair idea what I can get away with and keep warranty happy. I am nearly finished building from scratch a full 3" down pipe back exhaust system. I may run straight pipe, or I may build a pair of straight through "glass-packs" mufflers. I have not decided yet. I just bought a pair of Agency Power diverters (I think my factory ones are weak). I have a pair of BMC filters on order.

Has anyone installed the CTTS intake manifold on a 958 CTT, Porsche p/n 94811000661? Seems like a cheap and efficient upgrade. The engines are similar, I would expect it to be a direct swap?
Has anyone here seen "real" dyno results for a IPD plenum on a CTT? I cannot find anyone who has done a before and after dyno comparison, only the manufacture's claims.
What does a stock 958 CTT typically put to the ground for numbers? Its over 100 degrees here now, I'm not too keen on dyno'ing during the summer months here in Phoenix.

Sorry if this has all been said before, I've looked through the web and can't find the answers. I figured I'd reach out to you guys/girls and see what you know
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Old 06-12-2018, 08:47 AM
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On my Widebody 957 Turbo S with DFI motor I'm running an HHR Intake, ipd plenum, FVD Intercoolers, Fabspeed Secondary Cat Delete pipes, Evoms Billet Diverter Valves, a cargraphic muffler with NHP tips, and a Fabspeed Stage 2 tune. Not only does it sound better, but the car is significantly faster than stock - makes more boost for longer periods. But it's the tune that really woke it up and took advantage of the intake and exhaust mods. With you being CPO and having to worry about a warranty, I'm not sure you'll get a lot of bang for your bucks without the tune and I wouldn't do that until you're out of warranty. I have not put mine on a dyno though to truly see what it's making, but it's ridiculously fast now, like a Turbo S+.
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Old 06-13-2018, 09:05 PM
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PM me. I sell an exhaust upgrade for 15hp dyno-tested gains...
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Old 06-14-2018, 08:32 AM
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Hello kwyjibo,

I am going down a similar path with my 2012 958TT and I actually just dyno'd it.

Right now it is stock and put down 470hp and 511 lb/ft to the wheels on a Mustang dyno.

I am also in the process of getting a 3" custom cat back exhaust put on. My car is no longer under warranty so I am definitely doing a tune as well.

Good luck and keep us posted. I am curious to see how your exhaust comes out.
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