Personally i reckon leave the sound deadening laminated firewall in the XR's. If i was getting a late model XR i would value refinement.
Talking about noise etc, i think that on the AU's they really cut down on the induction side of things. Even on the AU1's from the intake tube to the ducting right up to the pipe that connects to the Throttle body seems so restrictive compared to the EF.
Under acceleration it seems the EF has a much nicer induction sound to the later models. You can actually hear it sucking air
I think instead of deleting the firewall, they should open up the intake even though it will sacrific abit of nosie but no doubt the pickup and of power will be better.
Just my thoughts...
Motor May 2001 Quote: "Believe it or not, there are actually a bunch of weirdos out there who reckon a six cylinder is the dux gutz. Bugger it: I'm one of them" :s5
AUII Late Ed XR6 HP T5 Venom- Full Tickford Body Kit, 17in Wheels, Herrod Bi-plane Spoiler, Momo Steer/Gear, T-Series Interior Options, Premium Stereo and a very light-tuned 4.0L I6
(FPV-Tickford Club of NSW Member and Co-Founding Member of 3FB Inc, Ford Forums Food Bandits)