Ive got a powerflow straight thro with decat and oval tail pipe, quite a nice sound, feels loads better without decat and its very good quality. Got it 2nd hand for hundred squid off someone on RSC, never had a problem with it even with it scraping on all the friggin ramps round my house. Some Powerflow places are naff tho, some really good, ask to see there work or customers cars or summit before you buy to make sure there a decent un