Originally Posted by markwb
Doesn't the engine require the back pressure from the muffler to run properly. I've thought that the exhaust valves will get burnt w/o some type of back pressure. Is this true or not?
Generally the CAT is able to provide enough back pressure removal of the rest of the exhaust will not remove enough back pressure to burn valves.
2001 ZX3 Zetec - Rebuild "The TICK" (
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2004 ZX5 SVT - Restoration "Code Name Rocket" (http://www.focusfanatics.com/forum/showthread.php?t=722698&referrerid=62897)