foild

hey guys!
tonight/tomorow i am getting my RB dual header installed with custom piping all the way back to the mufflers.
the shop that is doing the bending is not going to be using a mandrel bender... and ive heard that 2" is the best size for each pipe.. but my question is... should i increase that size to 2 1/4 since it is not mandrel?

thanks guys!

quick replies would be appreciated as i have to have the car @ the shop in less than 3 hours!

cwsttu

first off id just cancel... why spend money on this non mandrel bent... i know its tough and im going through it too but just save a bit more and have it done right or buy a good catback.... also what are they charging you for this? this dumbass in my town wanted 390 for a cat back fabbed up... .hell i can get a nice system for just a 100 more.... just my .02 cents... good luck

oh and about your question... since its not mandrel bent hhmmm... if it were me i would go 2.5 ... thats what many others do on the forum however i dont know if its a good bandaid for this fix

Makenzie71

Werd. SAve up and buy a propper exhaust.

Also, my systems are 100% mandrel...

foild

these are straight pipes we are talking about... from the header back.... one small bend...
this is not cat back here... its header back...

i dont think its worth the extra money for that one bend..

??

Makenzie71

Unless they're going under the body of the car and not in the stock plumbing route, there's going to be four roughly 35~40* bends to get to the stock muffler wells.

foild

and you think that is going to make a huge difference in flow?

should i do 2" or 2.25 ????

Makenzie71

I'll put it this way...if you don't think it'll hurt anything, then your goals are no where near any range that it would cause you problem. If all you're wanting is a LOT more noise and not so much more "go"....go for it.

Kenteth

speaking of which... BTW, I need to talk to you about court-- next time you see me online try to snag my attention

foild

doo - deeed -ddooo
so.. if i increase the pipe size too 2 1/4" it will fix the lost flow in the crushed bends.. right?

Makenzie71

no.

foild

why?

Makenzie71

long version ro short version?

foild

lol..
short

Makenzie71

Best exhaust will maintain a gradual flow from start to end. Rough and/or uneven bends, cats, mufflers, ripples in the metal, etc. all cause turbulance and turbulance hinders that gradual flow. Crush bends and rolled bends decrease the tubing size and add prtrusions in the way of flow, increasing turbulance.

foild

ok.. so if i got mandrel bent tubing.. would 2 2" pipes work well with my RB dual header?
or is there a better size?

Makenzie71

on stock port motor 2" would be prime. I f you intend to go with a ported motor later on you might want to save yourself some troubleand get 2.25.