ORIGINAL: cliffyk

If by "pretty much stock" you mean that no exhaust work has been done then do that first before spending money on a TB & plenum. A catted (or o/r if you wish) 2-1/2" X or H-pipe, and 2-1/2" catback will be far less restrictive then the stock exhaust and give a noticeable boost at higher revs.[/align][/align]Next, for a non-PI engine and 'twas me, I'd get a premium fuel tune (93 if you can get it) which will add considerabletorquebetween 2000 and 4000 rpm due to the timing advance possible with the higher octane fuel.[/align][/align]The plenum is the weak point in the OEM intake* and since thevolumetric efficiencyof the non-PI engine is not all that great (that's whyFord was able to add 35 HP with the PIchanges)the stock 65 mm TB is probably sufficient if mated to almost any aftermarket plenum.[/align][/align]As for the "best TB/plenum", Accufab's is generally considered to be the best-best however the TrickFlow/Professional Products (they are the same) cost about 1/2 as much and offer 95%+ of the performance. And again, and I do mean to harp on this, on a non-PI engine (even with a tune) an aftermarket TB/plenum will add very little noticeable gain.[/align][/align]======================[/align]* - Here areAccufab's flow numbers (reformatted)for a variety of TB/plenum combinations, you'll see that the 65 mm TB onany aftermarket TB will flow enough air to keep a non-PI engine happy.[/align]