Quote:
Originally Posted by Jonny042
Like Bill says..... it depends. But in general these should be a benefit over the 38mm version to 3.2L and up and maybe even a highly tuned 3.0.
The choice of 1-1/2", 1-5/8", and 1-3/4" primary diameter has been debated and covered many times. Headers in these sizes have been readily available for some time, if you're willing to go without heat. Of course there are a few aftermarket heat choices but IMO none quite as elegant as a factory style heat exchanger like the Eisenmann or SSI.
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Thank you Bill and Jonny. I agree 100% with both of you in that "it depends" on many factors, on one hand.
On the other...Bill said it best. "On the 964 3.6 they were fine around town at lower rpm but lost ~20hp at 6500 on the dyno." That's not a light switch, that at 6,400RPM they lost no HP vs better solutions, and at 6,500 they suddenly lost 20. I am not even sure if they lost 20 to the stock setup, or something better like B&B headers and a good muffler either. Regardless it's a sliding scale that probably started back at around 5,000RPM, and probably really kicked in at 5,500 when the intake flap opens. My particular car is my 1975 rat rod, so its light and SSI's would fit the look/feel of the car aesthetically. The car doesn't need any more power than it already either, its plenty quick. That said it's all personal, and for me I would not want to put headers on my street car that "cost me" power, and certainly not 20HP near redline.
I just keep hoping for the unobtainium of SSI's that are sized properly for a mild 3.6. I also think its just about impossible to do because the packaging required for SSI's shape etc vs the tubing size required for proper flow for a 3.6 don't mix. But hope springs eternal!
And again beautiful headers! Should be an amazing setup for the OP.