100% worth it. Turbo cars need no more backpressure than the turbo. Gains in the range of 25-30 WHEEL HP are seen from running just an open downpipe, no cat, no nothing. But, driving around with an open downpipe gets old quick. Best bet is to do the 3" pipe with 3" cat and a good strait though muffler like a magnaflow. Check out
www.fwdperformance.com or call Cindy at
281-288-4411. She has pre mandrel bent exhaust setups for our daytonas in 2.5-3" range. Plus mufflers and cats. Next best thing after that is to do a downpipe dump with either a manual cut out, or an electronic cut out valve that, when opened is the same as running an open downpipe, but you can close it after your done at the track......Or the street. 
Hope that helps. There are pics of an electronic cut out on my cardomain page if you would like to see what it is. I got the dump pipe and electronic valve both from summit racing. Plus, some really good info to be had about our daytonas at the other links in my sig. 
BTW, as far as price. You cant get a more effective mod on a turbo car for the price. Local shop or FWD performance. That is the FIRST mod you need to do on a turbocharged car. Helps spool, top end power, does not hurt a thing.
exhaust question
