vcci

Would a pulley make a big difference on my 07 63? I read somewhere that the expected gains are about 15hp, is this correct?

shardul

iTrader: (1)

not really.
I would rather focus on getting headers.

vcci

my only concern is CA emissions and sound. I currently have the res delete and am so happy with the sound, id hate to lose it. Unless it only gets better. Anyone hear both in person to compare?

shardul

iTrader: (1)

maybe a ECU remap then.

vcci

i already have the EC tune. would love some headers for sound and power. Are there any out there that would still pass CA emissions?

CharlyE500

You need to get a friendly smog check place. I did mine near my house when I didn't even know I could not have Header for Smog check. The guy let me pass....... For E63 I heard with Header will increase 30whp so it worth it. Other than Header not much you can do for 6.2L

W109 W211 6.2L

Pulley swaps on N/A cars rarely have any value and more than likely over spin other pulleys (Alternator, causing it to fail faster). Shardul is right Longtube headers are going to a better bang for the buck or a tune.

vcci

Which long tubes are best for the 63 and would I need to remove either of the cats?

SilverStrk

MBH pipes all the way... Make Great power.. Primaries will be deleted...

mc061680

DO ALL LONG TUBES DELETE PRIMARY CATS?

jrcart

To the best of my knowledge the Weistec 2.3 L blower is the only carb approved part for the M156 motor offered by any tuner in the world.