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Thanks Mike. I can appreciate your VW experience as I had VW buses for several years in the 1970's in Pennsylvania. Always brings to mind one Thanksgiving trip with my kids with a Coleman propane camp stove bolted to a 2 x 6 between the front seats (not very wise, but I was young and foolish). So yes, that was a big part of my choosing GHL for the 911. The heater boxes were not as effective as the stock item, but were OK if I kept the engine exercised (always fun). Also, they had removable cats that gave me some fallback if/when VA went environmental (we're now committed to install full CA requirements soon). Also the primary tubes are 1-5/8 inch OD. Although I can't see much of the primary tubing as they're almost totally enclosed in the heater boxes, but the size of the heater boxes makes me doubt that the tube length matches those nice looking RarlyL8 headers. Thus the question on whether a tuned long tube header set on a 3.2 with muffler will significantly improve on the approximate 10% power gain over stock that the dyno run indicated. I've read many posts that indicate the best gains with good headers are found with extensively modified 3.2's with no muffler, which mine is not (since installing the GHL system I've had the cam timing adjusted a bit and installed an SW chip). Only problem with GHL is the vibration induced failures.
I've narrowed it down to 2 choices:
1) Buy a set of good long tube tuned headers and a muffler that will keep me legal on the noise restricted tracks (DE's and auto-x's) and accept little or no heat and no option on passing emissions test (i.e. track car only).
2) Find a lighter muffler with well designed hardware for supporting it from the engine case and have an exhaust shop fabricate connector pipes from GHL collector outlets to new muffler. Problem here is the muffler should have an inlet on both ends to minimize bends in the new collector pipe, and the best candidate for that seems to be Dynomax which another thread here reported cracked muffler (vibration issue again??)
Hey, thanks for your comments!
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