Had the rear diffuser wrapped today

 

From the sound, I would guess the pipe diameter is a bit less, maybe 2 1/4 or 2 1/8. Could you check it or ask the installer; just curious.

 

will do
When I start it and set off on a cold morning, in second gear, when I lift off, I get some really nice pops, but it stops happening after a few minutes if I wanted it to be doing that a bit more often, would the best bet be removing the cats and then possibly tuning the map to overrun the injectors?

 

got any better pics?

im sure it looks much much better in person. not feelin' the wheels but. doesnt compliment the BS kit really well. maybe you need something more aggressive design wise (wheels) and needs to lower a bit more. thats just me though. sounds amazing!!!

 

Yeah, that is primarily a tuning characteristic. The excess fuel that is not burned in the cylinder, because you and the ECU decided you didn't need more power right now, explodes somewhere along the exhaust path.

Reducing the restrictions more by removing (I assume) the secondary cats will have the explosion happen farther downstream because the exhaust is moving faster; they will be louder since they are not muffled by the secondary cats and resonator and they happen closer to the exit.

Those pops probably have always been there, even with the OE tune. The sound is diminished greatly after traveling through the secondary cats, resonator, and muffler, as well as crashing into slow moving exhaust gases. I would not remap unless it was part of an ECU tune.

 

if you dont mind me asking how much did the body shop charge you for install and paint ? Also you might want to get the car wet sanded from the pictures there is a lot of orange peel .

 

I think the situation may be different with the 500, but I have Kleeman headers on a 550 and 200 cell cats with O2 sensors.

 

After my Eurocharged tune, I got a lot less pops in my exhaust.

 

They charged £1580 for fitting the kit and full respray, they blocked it down and mopped it since these pics, and I did some myself

 

Sounds like a plan, did you get noticeable gains?

 

Thanks very much, I will maybe get the secondary cats deleted and see how that is for a start

 

I did not do a before and after dyno, and the headers were done at the same time as the ECU tune. So I can't give you hard data. My seat of the pants assessment across ~60K miles is heck yeah.

A dyno, long after the changes, yielded a 306-308 HP at the wheels if memory serves me correctly. And again from memory a stock 550 is about 267 HP at the wheels.

 

Great stuff thanks, wonder if I can get the cats for mine, where did you get yours from?

 

The cats at the time of the header install were supplied by Kleeman and installed by an authorized performance shop under a local dealership. Since then I have had them replaced with Magnaflow 200 cell spun (cylindrical core) cats.

I think the issue may be with space for the 500. Although when I look at the cats they are not much bigger than the pipes (probably 3.5 - 4.0 inches in diameter).

I recall there is someone on the forum with a 500 and Kleeman SC. They may be able to shed some light on the cat issue/solution for the 500. Also, I think Kleeman is a sponsor on this forum.

 

Thanks for that will have a search now, update, wrapped the side fins of the front bumper today.