Did you TSR have the catalytic?
the weight diff would affect handling; in particular how well the rear wheel would stick to the road as it goes over every small bump. Shouldn't really affect take off - wheelies.
my arrow exhaust was horrible until I fitted the catalyst. Or maybe I'd just fitted it poorly - air leak at either of the joins? - that design never made sense, why not use a gasket?
So horrible as in leaks, or did you notice something like poor performance? One would think the cat takes power away, unless this engine needs backpressure. The TSRs are not available with catalytic to my knowledge, but the noise killers make the passage of the gases very narrow momentarily, anyway i cannot figure out any other reason besides added power to the wheelies, too bad it was a thin metal can and the noise was really considerable, and it is a little too skinny thus exposes the bracket behind. Also couple of times it died when twisting the gas from a stop, something that will probably never happen with the stock pipe.
I did wrap the link pipe, they made it so that the oil filter can be changed, but that results in the pipe being very close to a water hose, probably no need to worry but wrapped it anyway.
The price is pretty unbeatable, who knows i might go back to it.