How much more of a power gain will I feel If I get a mandrel bent catback opposed to a crush bent one? It it worth the 100 or so more dollars?

 

it really all depends on how far u plan to take ur car, if u arent gonna build it up then u wont notice the difference in power from a mandrel bent pipe to crush.
but if ur motor was built u would notice a differece

 

There is no black and white answer. It depends on how modified your car is. With your mods, maybe 2hp, seriously.

 

If the crush piping is big enough it's not a big deal. I had a friend run 14.1 at 99mph with a stock GSR in a HB with 1.75" crushed piping.