https://www.classic-ford.org/mr2/mr2play/tm.aspx?m=322(c) MR2 AUSTRALIA30adrian, the dynos are not repeatable enough to try to compare engines to within a few kw. there are simply too many variables. i do not find pod filters do anything and sometimes their design makes for flat spots and resonances. the only ways to get more power are to add more air/fuel by changing cams and/or max revs. adding the pod filter and/or exhaust will not necessarily admit more airhttps://www.classic-ford.org/mr2/mr2play/FindPost/324Fri, 15 Apr 2005 16:50:48 GMTwe have several 4AG and 3SG heads that are being rebuilt at present. We also now have limited stocks of really nice 1 piece race valves for both 3S & 4AG engines at what we think are sensible prices. Please call or email if you have any interest.https://www.classic-ford.org/mr2/mr2play/FindPost/322Mon, 31 Jan 2005 19:04:20 GMT