-- Message Boards -- 1968 California Special Limited Edition Ford Mustang GT/CS
D I S C U S S I O N . F O R U M
1968 GT/CS & HCS
2007+ GT/CS
1966-1967 HCS


Old 06/01/2008, 01:51 PM   #1
My Car Details
wally05's Avatar
I like Apple Juice

Location: Indiana
Joined: Oct 07
Posts: 198

Exhaust help?

Hey guys,

I'm thinking about replacing the exhaust piping, keeping the stock manifolds. It has new Flowmaster 40s b/c the old mufflers had a mouse nest in one. I had them do a bunch of checks for junk valves and stuff while it was in my shop. No problems on the engine. He said that the piping may be kind of homemade and have off balance flow, resulting in the popping I'm still getting off throttle. I will replace the gaskets for the manifolds during that time, but they are not leaking and letting air in the exhaust. It has header paint all over the piping anyway and I'd like to maybe do some better tips out the back and such. What do you think, guys? Recommendations? How much to maybe replace the rear valance and do gt tips out the back?

2008.5 Bullitt-#1911****
1968 GT/CS-Acapulco Blue/Black Interior
-J-code with 3-speed....
*Thanks, BroadwayBlue!*
wally05 is offline   Reply With Quote
Old 06/01/2008, 02:45 PM   #2
My Car Details
CougarCJ's Avatar
Spaceman Spiff

Location: Beautiful Willamette Valley
Joined: Jul 06
Posts: 1,851

My Garage
If you are thinking of upgrading your whole dual exhaust system, might as well consider upgrading to the freeer flowing repop HiPo 289 exhaust manifolds or do like I did and use 1969-1970 351W exhaust manifolds. Very similar to K-code manifolds and much more free flowing than the log style 289 exhaust manifolds. I also used a factory type H pipe for the 351W, slightly tweeked for my 302-4V. Muffler shop did the rest, ends with angled cut and bent pipes at the rear valance.

Scott Behncke
1968 GT/CS 302-4V Honors flysis income beezis onches nobis inob keesis
West Coast Classic Cougar A good source for Mustang mechanical parts too.
CougarCJ is offline   Reply With Quote
Old 06/01/2008, 07:30 PM   #3
My Car Details
franklinair's Avatar

Location: Franklin, NC
Joined: Mar 07
Posts: 4,069

My Garage
I converted my 302 to dual exhaust - from the manifolds, back - including the GT tips & valance. My engine is bone stock, so I did not opt to change the exhaust manifolds. The dual system, with an 'H' pipe (a MUST) cost about $400. The GT tips, about $90. The repo GT valance from NPD, about $40. Be advised the repro valances do not fit well. The one I got was 3/4" short on the right side, and the left side contour didn't match-up to the rear fender contour. I ended up using my original valance, and had a body shop splice in the exhaust cutout areas. Metal work + paint cost $300. Bottom line, my dual exhaust system cost $800+/-. I like the look & sound, but the jury is still out - deciding if the project was worth the cost.


If my memory serves me correctly, to be CORRECT, GT dual exhausts used a muffler mounted transversely forward of the fuel tank. I think these part$ are $till available (If you get my point)
franklinair is offline   Reply With Quote
Old 06/02/2008, 10:12 PM   #4
My Car Details
@Holmes's Avatar

Location: McAllen, Texas
Joined: Dec 06
Posts: 238

Check this thread:

I profess to know nothing and only wish to associate with those who do!
@Holmes is offline   Reply With Quote
Reply Forums > GT/CS and HCS Forums > GT/CS and HCS Discussions

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
2005-2007 Exhaust Systems westwood GT/CS and HCS Discussions 17 08/01/2007 07:18 PM
Questions - BRAKES AND EXHAUST manifolds gt bandit GT/CS and HCS Discussions 6 05/27/2006 07:55 PM
Exhaust Questions jc68gtcs GT/CS and HCS Discussions 2 04/25/2006 09:04 PM
Exhaust for GT/CS dbeal GT/CS and HCS Discussions 8 04/25/2006 09:32 AM
428 Cobra Jet Exhaust GTCSMustang GT/CS and HCS Discussions 6 04/22/2006 10:30 PM

All times are GMT -7. The time now is 12:18 PM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.

This site created, owned and maintained by Jon Hanna - Copyright 1996-2011
All rights reserved. is not affiliated with Ford Motor Company

ShowCase vBulletin Plugins by Drive Thru Online, Inc.