Supersprint headers + exhaust
If I could gain 46rwhp from a full system I'd be very happy - but on a 507 that is unlikely. I'm hoping a 50-60rwhp gain from full Supersprint system (Headers to tailpipe) with tune and filters is possible.
IPE and Agency Power headers are basically the same according to my source - different brands, same factory in Asia. Both look great and both fit right hand drive or left. My only issue with them is that my tuner only found 15rwhp with a full system. I'm not paying good money to gain only 15rwhp, no matter how good the sound. Be interested to see if others found a lot more power than that. Might have been a bad set - but they looked good.
The company I spoke to ended up doing Cargraphic headers with Supersprint catback for the customer they were working with. I didn't get any feedback on gains.
I doubt the gains between the various mid/long tube headers are significantly different (ie IPE vs Supersprint vs MBH etc). Sure there would be variances, but anything over a 10-15HP variance I would put down to the car / tune / dyno rather than one brand of headers being materially more effective than another.
re power variables - assuming they are all close in design I would agree. But little things can make a difference such as primary sizes, stepped design, merge collectors, flange fit, weld protrusions inside the pipes etc - all make a difference. For racing there can be 20-30hp between race headers that look like equal quality to the eye on the outside.
The problem with headers and standard cat back is that it can make your car really loud. Adding custom mid/back end provides options for toning down this sound a little (additional resonators, valve systems etc). That may or may not be a priority, depending on preference.
The Best of Mercedes & AMG


