Originally Posted by neil oswin

Go for a Magnex,i have one on mine & it sounds great! Works better with a good induction kit,i have PiperCross Viper on mine and i don't half growl! Pops n bangs too when ya floor it in 1st n 2nd then let off the gas! Failing that go for a Milltek for quality.Give Pumaspeed a call at Wakefield they know their stuff! The Ford cat is crap (600cells) it kills performance,i have a Milltek cat welded into my de-cat pipe,its a bit of a bodge job but its passed mot for last 3 years so must be ok,had that done at Pumaspeed. Milltek are designing a new sport cat for the ST170,using my car as a test car for this,but not sure when it will go into production as its early days yet! Hope this advise helps ya mate,good luck........