[gimp2x]

for those of you who suggested he do it, how would you "tune for loss of backpressure"?

Do you even know what that means? lol

I think this is a concept of too much internet reading by so called experts. Loss of exhaust back pressure on a turbo charged car is nearly an oxy moron, quicker spool, larger CFM intake are the only things forcing a "retune"

[e90AW335i]

Originally Posted by Flat Out 32

Man this is a great topic and with great timing. I just installed an intake and was looking into the "obvious" next step: exhaust. Should I go for DPs and leave the OE mufflers or get a cat-back with stock DPs? Reading from this thread DPs are the logical step but what pointers can you give me? Hope the new setting works for you and keep posting useful topics!!

I didn't gain much from either but if I had to choose one I would say go with catless DPs and stock exhaust.

[GAaaAR]

You should do a dyno before and after you take out the exhaust and dps to make sure that your initial dynos were correct on a 5 hp difference.

[e90AW335i]

Originally Posted by GAaaAR

You should do a dyno before and after you take out the exhaust and dps to make sure that your initial dynos were correct on a 5 hp difference.

Why would they not be correct?