I'm not very familiar with the underside of a 4th gen but if you're having a hard time finding a spot to route the extension you could always get some spark plug boot insulators and slip them over your wiring for extra protection. I did that on a buddy's C5 2 years ago and he's still had no problems.
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--==RPM Resto & Custom==--
1989 IROC-Z Media Coverage:
Chevy High Performance - Readers Rides 4/03
GM High Tech Performance - Tech Article 3/06
Chevy Rumble - Tech & Feature Articles November 2006
Auto Restorer Magazine - Feature Article 5/11
SkinAndSteel.com
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