Black soot on rear bumper

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streetspirit7
Posts: 559
Joined: Thu Mar 18, 2004 8:35 pm
Car: '97 240sx

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I've noticed alot of black soot on my rear bumber since I did my SR swap. Is this a normal thing? I have a s14 SR running stock with a 3" exhaust.


Blown240sx
Posts: 1963
Joined: Thu Apr 21, 2005 3:20 pm
Car: 1996 240sx

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Most likely fuel that isnt burned Most SRs with no FPR will run rich its pretty common.


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