[ike84]

If you're gonna break it in on a Dyno, will you please humor me and test out a catless or high flow cat system? Also, I don't know what intake you're using but anything smaller than 82mm would be a mistake I think

Here's why I say this -

When I redid my 2.7l with a short ram 82mm intake, high flow headers and shorty glass packs, and run on oem 996 row fuel maps, my LTFTs are -17% (with afrs of 14.7 cruising and 11-12 wot). I've never dynoed my car but if the fuel consumption is linear to power output, that means that my car is now making 245 hp. I can almost guarantee that using the stock intake and exhaust will rob you of a significant amount of power output.

That system just wasn't designed to breathe - it was designed to meet stringent exhaust and nose control regulations (especially in the eu). If you look at recommendations for exhaust tubing size based on HP, the 986 system is undersized even for the 207 hp mark. You're probably looking to produce 300-350 hp right? You should have a 2.5" dual exhaust system for a 3.8l displacement. In terms of intake, depending on your gearing and again assuming 3.8l with 85% ve and 7200rpm redline, you need a 4.25" intake to completely eliminate all resistance (this isn't factoring bends and recessive length).

Don't get me wrong, I'm not trying to criticize, I'm just wanting to relay my experience. A really simple test would be the following - after break in, do a Dyno wot pull and calculate power outputs. After that, disconnect the intake and hook up your maf to an 82mm housing and nothing else. Disconnect your exhaust and put on only a pair of cheap eBay catless headers with your precats nbo2 sensors installed. Run for a bit like this again on the dyno to allow to ecu to recalibrate to your changes and then repeat your wot pulls

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