Maxposer Posted June 5, 2013 Share Posted June 5, 2013 Hi all Ok dont know if this was posted before but i bought a second hand 4-2-1 japspeed exhaust manifold and it has been flatted at the bottom due to speeed bumps...i have been told this will effect performance and should just leave my standard manifold on ? any help guys is this true? cheers Quote Link to comment Share on other sites More sharing options...
Paulvti Posted June 19, 2013 Share Posted June 19, 2013 Post a picture of how badly flattened it is.... Quote Link to comment Share on other sites More sharing options...
HONDACIVIC Posted July 1, 2013 Share Posted July 1, 2013 Yeah depending on how badly its bin flattened but tbh i had a japspeed 4-2-1 mani along with a decat and mongoose got some right gains. then i choose to get a japspeed 4-1 manifold but now it sounds betta but its defo lost some power Quote Link to comment Share on other sites More sharing options...
HONDACIVIC Posted July 31, 2013 Share Posted July 31, 2013 Yeah sounds allot more aggressive at 6k but has lost the low end power i can defo feel the loss unforunatley but hey sounds allot better now sorry for the late reply guys Quote Link to comment Share on other sites More sharing options...
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