Martin, Great article. I like the fact that it is based on experience rather than theory You referred to a cat converter bypass pipe. We call those a Cat test pipe. Is Ed Uding selling these? I would be interested in obtaining a test pipe for Off-Road use only. I don't want to break any US laws. Scott Mueller 002981 DOA 5031 -----Original Message----- From: Martin Gutkowski [mailto:webmaster@xxxx] Subject: [DML] Exhaust manifold gasket replacement Massive snip by Scott I'm replacing the cat with Ed Uding's bypass pipe, so this wasn't something I did. I have some photos waiting to go on the website. Best Wishes Martin #1458 DOC UK