Where did you buy that motor from??That look like a thundertiger want a be. Here's a header that will work for you!!!! Trust me on this!! I play with nitro trucks. This team 4.6 header will work.it will fit.21-.32 motors. The only differents is the header gaskets.there two sizes.all these style headers are universal=they fit all.21-.32 with that type of exaust header. Why go buy a Rossi or O.S header??? there pricey and your paying for the name.you can find the headers on ebay most of time under $12.Look and see what I'm talking about.[link]http://cgi.ebay.com/NEW-Monster-GT-Tuned-Pipe-Header-Set-Complete-MGT_W0QQitemZ160164078111QQihZ006QQcategoryZ44028Q QssPageNameZWDVWQQrdZ1QQcmdZViewItem[/link]