I just got the Greddy Evo2 cat-back and the Greddy 4-2-1 headers for my 99 honda civic ex. My question is do I need to put some RTV Silicone Gasket Maker around the Greddy gaskets? If I don't have to is there any harm in puting it on anyway? I have done this before, but it was just a stock swap and it was not my car so I put some Gasket Maker on the gasket . This time it is my car and alot of money so I don't want to F it up..

Thanks for the help.