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t
I'm in the prosses of replacing the exhust system on my 79. I already have new headers and chabered tubes. I can't decied on the x-pipe. If anyone has installed one where did you put and did it make a differance.
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I put in an H-pipe just behind the trans cross member. I don't know if it did anything but sounds better.
Brian - NCM Lifetime Member
73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
3.55 gear BTO 200-4R trans,
Leather seats, Seatbelt Plus 3point seatbelts, Pioneer CD player
Magnaflow Exhuast System
Dewitt radiator and dual electric fans
Borgeson Steering box

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Free Member
Send PMOrland Park, IL - USA
Joined: 11/14/2003
Posts: 43
Vette(s): 1973 TT custom pearl orange paint
355 ci, modified Turbo 400, 3.55 rear end, R134a air, balanced & blueprinted custom engine work, deluxe black interior
When I was replacing the exhaust on my '73, I asked about an "X" or "H" cross-over. Two exhaust specialty shops (as well as the speed shop that did some of the engine work) told me they improved HP, but usually only above 6500 - 7000 rpm. Below that they could help the sound, but also created another area for potential problems (leaks, etc.). Hope this helps.
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c
I didn't do it and I wish I had. I have the Dynamax coated headers and chambered pipe mufflers. It's supposed to mellow out the sound and eliminate the vibration at mid-rpms. It sounds good, but it could use the crossover.
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v
An "X" or "H" pipe is supposed to balance out the back pressure from each side of the engine. This allows a better flow and more HP. The sound is much better too! 

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in Forum: C3 HVAC, Fuel, Emissions, and Exhaust
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