[QUOTE=mjannone;567143]
Quote:
Originally Posted by itsnotanova
I purchased the NHP headers and mid pipes from Softronic (DME tuner) as part of the 3.4L conversion package. Softronic's website says the headers are 42mm primary piping (vs. 34.5mm for stock) with a 53mm exit pipe (vs. 42.5 for stock), and the mid pipes are 50mm (vs. 40mm for stock). These all appear to be an improvement over stock.
I am using the stock small-diameter U pipes that connect the mid pipes to the Beluga ebay muffler. There clearly is room for improvement here as these stock pieces are 40mm in diameter.
I am curious to know if the more restrictive, but larger diameter 987 muffler you have is a better performer than the less restrictive, but smaller diameter Beluga ebay muffler. I do know the Beluga muffler sounds insane at WOT where it is a full-blown race car soundtrack. Neighbors (and most wives) will object. It has calmed down a bit in the 400 miles I've put on the car since installing it, however there is no mistaking that its a performance car now. When I had the stock 986 muffler on the 3.4L, there was virtually no difference in sound from the 2.5L. It was quiet and unassuming, and obviously down big time on power.
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Post 185 of my build thread
Woody's build thread, I go into detail about my exhuast system. You'll have to use Google Chrome to see the pictures. I'm thinking your problem is the factory U-pipes. You're only as big as your smallest opening. My whole system is 50mm or larger throughout and has a smoother path than the factory 986 or 996 system. I'm thinking the system I built might be less restrictive than the 996 system as I made more power than a factory 996. That's if the dynojet was correct. That also might explain the lean running condition. More air in and out but no increase in fuel.
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