sasquatch Posted September 15, 2009 Report Share Posted September 15, 2009 i have all the tools needed and have done this a few times before, for my mk3 golf gti. but am plannin to build on for my little project but am un sure what back box to use, if i use a standard lupo 1.4 sport backbox on a traight through bit of pipe how loud to people think this will be and will it effect performance anyway??has anyone else buil themselfs an exhaust too that can lend few tips Quote Link to comment Share on other sites More sharing options...
Defcon5 Posted September 15, 2009 Report Share Posted September 15, 2009 straight through to the mani? Will be very loud, and have a negative effect on performance Quote Link to comment Share on other sites More sharing options...
sasquatch Posted September 15, 2009 Author Report Share Posted September 15, 2009 straight through to the mani? Will be very loud, and have a negative effect on performancewat u think i shoul do?? Quote Link to comment Share on other sites More sharing options...
Defcon5 Posted September 15, 2009 Report Share Posted September 15, 2009 Nothing to stop you building it yourself, but Id add some silencers and a cat of some description Quote Link to comment Share on other sites More sharing options...
Unheard Posted September 15, 2009 Report Share Posted September 15, 2009 The standard backboxes have that valve system so i would think its still not going to be as loud as a 3rd party back box would beit will also keep some of the back pressure Quote Link to comment Share on other sites More sharing options...
TomStevo Posted September 15, 2009 Report Share Posted September 15, 2009 why not jus do it cat back? removing the rear silencer? i have been advised its best to keep the cat on lupos? Quote Link to comment Share on other sites More sharing options...
sasquatch Posted September 15, 2009 Author Report Share Posted September 15, 2009 whys it better to keep cat?? Quote Link to comment Share on other sites More sharing options...
Defcon5 Posted September 15, 2009 Report Share Posted September 15, 2009 You need backpressure in little NA engines Quote Link to comment Share on other sites More sharing options...
Steve TDI Posted September 15, 2009 Report Share Posted September 15, 2009 Straight through 2" system with 2 silencers. ;X Quote Link to comment Share on other sites More sharing options...
Unheard Posted September 15, 2009 Report Share Posted September 15, 2009 Modern exhausts are designed to take into account the CAT unlike when they first started putting them on cars and just added them on to a normal system making it hugely restrictive. From what i have been told you do tend to lose power on NA engines when getting rid of the CAT. I hate to say it but i think my aftermarket exhaust may even be worse when driving at lower revs than the OEM system, it is a trade off though as it is certainly better higher up and the revs shoot up quicker than before when your foot is down hard. It is much better on over run than the standard exhaust and that can only be a good thing either.You may want to brows through some of the articles on autospeed i am sure you will find lots of useful information http://autospeed.com/cms/search/index.html...mp;x=18&y=9I would love a straight through system with a Varex back box you cant really lose you get the best of both worlds Youtube Video -> Quote Link to comment Share on other sites More sharing options...
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