I have heard that putting 2 or 3 exhaust "spacer gasket things" in place instaed of the 1 required will increase low end torque. Has anyone done this and how much of a difference will be gained ?
You can get an FRP torque ring that replaces the OEM seal.
It's about 10.00 and is gives better low end response by changing the exhaust port timing. Nice mod for the money!
You need more like 1/8" to 1/4" to get a "noticeable" difference. The exhaust gaskets tend to compress [that's how they work] and whatever increased length you had is decreased -- Maybe go back and add a couple more. An 1/8" steel ring is probably cheaper though. The longer tuned length resonates at a lower frequency --moving max power to a lower rpm.