Dizzy_PD Posted January 28, 2020 Report Share Posted January 28, 2020 Anyone ever straight piped an SDI? I've heard the backbox can be restrictive on it, would removing it free up some more mpg? My main concern is noise, my downpipe has rusted away and separated, its extremely loud. If I put a straight through from manifold all the way to the rear would it still be extremely loud because it's NA? My 1.9tdi isn't that loud straight piped, but that's probably because it's turbo'd. i know someone will have done it.. cheers Quote Link to comment Share on other sites More sharing options...
mk2 Posted January 29, 2020 Report Share Posted January 29, 2020 Tried it. No good. You need a restrictive exhaust on an SDI because the cam is timed for higher back pressure to increase the torque. You'll probably get more power but less torque. Helps on turbo cars though. Quote Link to comment Share on other sites More sharing options...
Stephenmacleod Posted January 29, 2020 Report Share Posted January 29, 2020 10 hours ago, Dizzy_PD said: Anyone ever straight piped an SDI? I've heard the backbox can be restrictive on it, would removing it free up some more mpg? My main concern is noise, my downpipe has rusted away and separated, its extremely loud. If I put a straight through from manifold all the way to the rear would it still be extremely loud because it's NA? My 1.9tdi isn't that loud straight piped, but that's probably because it's turbo'd. i know someone will have done it.. cheers 1 hour ago, mk2 said: Tried it. No good. You need a restrictive exhaust on an SDI because the cam is timed for higher back pressure to increase the torque. You'll probably get more power but less torque. Helps on turbo cars though. what he said. mine appears to be straight piped and its even more gutless than usual going uphill. that and its effing annoying how loud it is. however if you want to swap a stock exhaust for my straight pipe, your welcome to it haha. Quote Link to comment Share on other sites More sharing options...
Dizzy_PD Posted January 29, 2020 Author Report Share Posted January 29, 2020 Haha you wouldn't want it, it's snapped in half. Would a decat be detrimental to torque then? I've got a piece of pipe which I can weld in place of my cat to fix my issue. this way the backbox is still one, keeping it quiet. thanks Quote Link to comment Share on other sites More sharing options...
Sausage Posted January 29, 2020 Report Share Posted January 29, 2020 I'd go straight pipe to the rear silencer. 1 Quote Link to comment Share on other sites More sharing options...
Skezza Posted April 7, 2020 Report Share Posted April 7, 2020 I had one. Made the car sound utterly awful. Quote Link to comment Share on other sites More sharing options...
Stephenmacleod Posted April 7, 2020 Report Share Posted April 7, 2020 8 hours ago, Skezza said: I had one. Made the car sound utterly awful. My daily struggle. Why anyone would on a veg burner through choice is beyond me. I'd replace with a stock if I could be arsed and wasnt such a tight arse. Quote Link to comment Share on other sites More sharing options...
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