Re: Possible header use on my 1970 1.7 triumph motor - Saab Saab Model 99 Bulletin Board - Saabnet.com
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I don't have much direct experience with the 1.7L, so my comments are general, you know the value of free advice :-)
Going to a "header" type system to increase exhaust flow can increase power, however, it is likely to raise the torque peak which may actually make the car feel "worse" in that you have to rev it more. I recall reading that a 10% reduction in 0-60 time is about the smallest that you can actually notice without a stopwatch, and I would not think you will get that much. And even at all that, 7-12% power boost seems like a lot for just changing the header. As time went by, Saab did go to a "4-2-1" exhaust but there were also changes going on with intake tuning and larger displacement, so they were doing other things to keep the torque up. At the end of the day, torque is mostly what you feel, especially at lower speeds.
All that having been said, I'm all for experimentation. Try something and see how it sounds and feels. Just keep your old parts in case you want to go back!
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