I'm debating between 2 headers for my 2010 E550 coupe (NA 5.5 V8) Kleemann headers ($1295) or RENNtech headers ($4480)

I choked on the price of RENNtech headers, but something tells me that the quailty must be better than Kleemann IMO. RENNtech is a direct bolt on, but Kleemann doesn't seem like it. Kleemann comes with Catless Downpipe as well.

Anyone installed one of these? Any experience?

 

Just looking at design Kleemann should provide better power/sound but probably nothing close to real long tube headers. RENNtech is a joke imo, basically same design as stock header with offensive pricetag.

 

Kleemann header the quality, power, and price make it the best buy.

 

mgbm

How did you go did you end up fitting the headers

Im looking to do the exact same modification on my e550 , also which company had them listed for $1295 the cheapest Kleemann headers I found were $1495 from Vivid Racing

 

I decided to go with Kleemann since they are significantly cheaper. I haven't bought them yet, still looking for the cheapest price online.

 

Mgbm

Looks like vivid racing has the best price of $1495
Once fitted I'd go with a custom dyno tune I don't rate the mail order style tune

 

You are correct, I've read somewhere online and Kleemann headers do require an ecu tune since they come with catless downpipes too. I think I wil be getting a RENNtech ECU with Kleemann Headers combo, since Kleemann ECU tune will physically drill a hole to your ECU; RENNtech doesn't.

 

But make sure it's a custom tune - that is the tuning adjustments take place to the vehicle in real timing whilst on the actual dyno

The other tunes which I don't rate are pre loaded generic tunes that can loaded via a handheld unit

So yes please get it tuned on the dyno the power difference is quite significant

 

mgbm

I just emailed vivid racing as to why they have two different prices for the kleemann headers one is $1495 the other $1895

Once they get back to me I'll post it up