How do I quiet this for street driving
But there are items you can shove inside that will reduce noise if you are unable to attach a proper muffler ( or replace the section with a muffler )
eg
http://decibeldevil.co.uk/home
this guys had a similar issue. Used a special tip
looking now... 4" ID is largest shown...
https://www.magnaflow.com/02product/...p#racemufflers
5" dynomax...
http://www.dynomax.com/mufflers/race...und-24252.html
vbands....
http://www.racepartsolutions.com/ind...?custom_f_2628[0]=352e3030&Itemid=564
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Its a boost activated cutout by sound performance near Chicago.
When I get into boost it opens and is a straight open downpipe to the ground allowing for excellent unrestricted flow when it matters. This is a 4inch downpipe but you could go 5inch if you want.
The pipe attached to the side of the dp is a 3inch and is routed easily through the k-member and connected the normal exhaust. Around town it sounds like an ls1 f-body with a flowmaster catback. When I mean business it just go wot, no pressing buttons and waiting 5-10 seconds for a cutout.
Only downside is sound is the only one that makes the boost activated cutout and it was about $500. Been like this for 2 years and works great.
Alex
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