Originally posted by darpinian:
The Weapon R headers require welding, is this because they come with the 3 bolt flange(which only work on ATX and very very few MTX) and you have to weld to properly connect the 3 bolt to a 2 bolt? Or is their more that needs to be welded.



WR headers only come with the 3 bolt flange.

What is typical for the WR headers is to replace your stock 2 bolt flange with a 3 bolt & the WR fit there. Other problems with them commonly reported are: 1) the EGR connector is not proplerly located & the EGR tube requires bending or other effort to gain the extra length to fit right. 2) They come with no hardware for installing. You've gotta go out & get bolts, nuts, gaskets. 3) They are SS so they radiate a LOT more heat under the hood than the MSDS design. This may account for the noted flow differences, but I'd expect that to be minimal.

Originally posted by darpinian:
Also, My understanding of the Weapon Crap headers is that they copied the MSDS design down to the Tee but they didn't change bolt flange for the ATX MTX difference. So does this explain why some people have no problems with the weapon R and other do because of the welding?

Lastly, I read either here or on NECO (can't remember) that the MSDS headers flow better, how could that be if they were both mandrel bent and Weapon R took the EXACT design?



See note 3 above.

Must be that jumbly-wumbly thing happening again.