Kamtrac

I have a 2012 E550 that I want to get more power out of. I have already done the following:
1- Eurocharged ECU upgrade
2- K&N Filters
3- Resonator delete
What else can I do to add more HP??
I thought about changing the downtubes but was told I'd only gain about 30 HP which doesn't justify the expense to me.
Who should I talk to? Help!!

TheVazha

Bud, "downpipes" are just 3" pipes that any competent muffler shop can build for no more than $200. Not sure why anyone is paying more than that for them, unless of course you care about them being shiny stainless ones. If you don't, which you shouldn't, just go into a muffler shop and tell them you want 3 inch pipe from your headers back to your resonator, or dump the resonator and do an x pipe. Voila, $2000 down pipes for $200.