I have all ngk spark plugs, new hooker headers, everything in my sig...recently after putting a new catback on,( I had to shake the exhaust around a good amount getting it on) it makes this popping sound, almost a clicking, when I popped the hood to check it out it theres a shot of light that shoots out from right at the #5 plug, I cant tell if its a spark or a little flame... I could really use some help!!

thank you

Chris

 

most likely one of your plug wires touched the headers and its arching out...any hesitation issues?

 

Agreed. If you can't move it far enough away, you might have to get some OTVC wires. You said hooker headers but not whether they are LT's or shorties. If they're LT's then you should definitly get an OTVC set like the one from Thunder.