XK 4.2 standard exhaust construction
#1
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I’ve been looking for a 4.2 XKR back box to no avail and am now considering getting the standard back box modified - knocking out blanked off pipes and welding into the existing two outlets via electric valves so I can have it loud or quiet.
Before I start I just wondered if anyone knows definitively what the box/pipes are made of? Look too well preserved to be mild steel, possibly 304 or some other stainless alloy?
Before I start I just wondered if anyone knows definitively what the box/pipes are made of? Look too well preserved to be mild steel, possibly 304 or some other stainless alloy?
#2
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Even with the valves fully open all the time, the exhaust is not loud. Normal driving around town is plenty quiet and silent on the interstate. I wouldn't go to the extra trouble to fit valves. I removed the vacuum pump on mine, "while I was in there", and honestly don't notice a big difference.
#3
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^^ Same here. I don't have vacuum valve connected on my XKR back box (permanently open) and the exhaust note is not loud with normal driving. It gets throaty when you put your foot in it, but otherwise not loud at all. It might be worth the wait and search for an XKR box and not go to the trouble of cutting up your XK box.
Last edited by David993S; 08-13-2024 at 09:54 AM.
#4
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He has an XK, no fuse to pull. His exhaust valves are normally closed, opened only by exhaust gas pressure.
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Jeremy07XK
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