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loved mine. never gave any issues. mine didnt fit with my arh's due to the unique tube design so i sold it and just put a stocker back on. sounds cool to boot almost like a "dragster" starter when it kicks over
not really sure on the qtp part. Arh's hug the block really tight which is why it doesnt fit. I know they work fine with kooks, pacesetters, and tsp's so if qtp's are like that then they should be fine