stopping exhaust leaks

[CUMMINSTD]

Ok I got my twins dialed in good but I keep developing a leak between the got pipe and the big charger. I don't think it started till I pulled it apart once and re used the same gasket. Are the steel gaskets reuseable and is there a gasket maker or anything that will help?

 

[XLR8R]

Make sure the flanges are flat (rubbing block, belt sander, blanchard machine - whatever you happen to have out in the garage LOL) and/or use multiple gaskets & copper spray.