This is a continuation of another post but now onto a different issue.

Truck is a 2003 Avalanche 2500 with the 8.1L. It has a K&N FIPK, NGK Iridium plugs and Taylor Thundervolt 50 wires.

Okay new exhaust (Magnaflow Catback) is on but I have now run into 2 other issues.

1st problem: Somehow bad gas got introduced into the system (Most likely the previous owner) Seems all 8 injectors are hopelessly fouled. The mechanic brought out one and it was so plugged you couldn't even see the screen. Seems the contamination is rust (A magnet will draw the stuff to it) which has deteriorate to the point it is fine as flour so it got thru the filters and ruined the injectors. The gas tank is full of the stuff so I had to have all 8 injectors replaced, filter replaced along with the gas tank dumped and fuel system flushed out.

2nd Problem: Seems I have a cracked exhaust manifold on the passengers side. Good time to upgrade to a set of headers. Any recommendations? I want to stick to stock so I was thinking a set of shorties either ceramic coated or to save money stainless but wrap them with the insulation tape.

 

Most people on here say shorties aren't worth the money and to go with longtubes if you want to see decent gains. I'm sure others will chime in because I don't know if there are better gains with shorties on the 8.1L than the LSx engines.

 

If i could do it agian i would go with the LTs. The shorties are ok but theres nothing like long tube headers. Stainless is the best IMO.

 

...and header-wrap is not recommended, stainless or not!