bluejae

i've tried doing some research on my own to answer questions such as sound changes and possible performance differences... some say the placement of the x or h pipe can make a difference in performance and some say straight would gain the most... but this information was from other's experiences with other cars and not the c63...

my questions are... does anyone have headers with straight pipes all the way to an after market exhaust system? if so, what's your take on the sound and performance change?

if there isn't anyone with this kind of set up... for those who are more knowledgeable... what would be the pros/cons of going with a straight pipe set up and not having anything connecting either side together... so basically, each side would go straight from the headers all the way out the muffler...

MoC63

i would imagine full straights would have you lose some power as you need some back pressure.

hopefully others will chime in.

_AMG_

I don't have LTH's but have had both a complete straight pipe (including resonator delete) and X pipe setup. The power felt the same, only 2 hp difference between them but the X pipe setup gave me a little more increase in torque vs the straight pipes. The sound is alot more smoother with the X pipe, the straight pipes sound very loud and more raw.

Dads C63

You need an X-pipe or H-pipe of some kind. Balances the two banks and makes more power, sounds better, and makes more torque.

MoC63

are there any manufacturers for C63 x-pipes (that delete the secondary cats and resonator)? the M3s had a lot of x-pipe options but i can't seem to find any for the C63. is it all custom work?

bluejae

I read that it would probably sound better but some have said otherwise about making more power. But this isn't necessarily on our cars. I read that you don't lose power but instead may shift where the power goes in the power band. And on top of that, a custom tune can remedy that.

Even Money

^ I think I would trust Dad's on this one...

Mikegpr03

+1!

bluejae

doesn't mbh have one? or that company called gtpro something i think

Mort

Like bluejae said here are a couple of x-pipes :

MBH -> sponsor http://mbhmotorsports.com/

GT-Pro sold through Ronal Wheels http://www.ronalsales.com/

bluejae

i realize that he has done a lot of work to his car but i'm not aware of him trying either of these setups with his exhaust system... maybe i missed it...

i'm not trying to argue here... but i'd like to know why adding an x pipe would somehow provide more power and torque for our car? and how dads came about with the decision to go with an x-pipe setup? was it his choice? or was it a suggestion from a tuner? if so, what was the reason behind that?

Dads C63

Jae,
Its not my preference nor a suggestion from a tuner, its physics. When you bring the two banks together they balance each other. By crossing each other the exhaust pulse from one side helps sucks the next one out the tailpipe thus the scavenging effect. The stock exhaust has a 1/2" H pipe. The peak HP may not improve but the low/midrange torque will and thats what our cars need. Hope that explains it better.

Lenin

+1. It is about the scavenging effect. You want to create some vacuum to help pull the exahust gases out instead of making the engine push it out.

bluejae

interesting... so are you running an x or h? and where is it installed?

so then if i were to go with a straight pipe set up and replace my stock mufflers and resonators.. i would actually end up losing power compared to my stock mufflers? or would i still gain some but not as much as if i were to have an x or h pipe installed?

Dads C63

I am running an X-pipe.
I'm not sure what all you plan to replace with straight pipes but be careful, it gets very loud. Most racers are running MHP L/T headers, no cats, with the stock resonators and mufflers.

E55 Bulldog

I have been thinking about doing this also but am not to familiar with this cars set up as well as my old one. If we go with an X-Pipe what does that actually replace on our cars, the res or the 2ndary cats? I planning on keeping the stock exhaust as it is a good exhaust for our cars.

Also when it comes to x or straight pipe I thought flow balancing really only shows gains after the manifold collectors... so anything far back prob only has min gains. They're commonly used by OE's to quiet a car down a bit... so in that case straight pipe would be cheaper and easier... but im not 100% sure about the sound vs the x-pipe...

???

I may be off in my thinking, let me know what you guys think?

bluejae

my plans were to try out the top speed pro-1 exhaust system with my mbh set up... and i believe that would make my system all straight pipe until the mufflers...

where is your x-pipe installed? what does it replace

i've read something similar as well regarding flow balancing/scavenging... but i've also read about a car that was tested on the dyno with open headers, x, and h set ups and the x made very minimal gains... but i'm wondering if this depends on the engine...

http://www.carcraft.com/techarticles...ion/index.html

peh-amg

Which one of these is best (quality, sound, etc) or are they both basically the same?

bluejae

also... if i'm not mistaken, isn't the akrapovic exhaust straight pipe and it can attach to most header setups?

Mort

I have no personal experience with either but think they are close to the same. MBH is a sponsor here and think you may get better service through him. There are a few users on here so do a search. Maybe someone will jump in to help you out with some more information. Send _AMG_ a PM as he has one and he knows a lot about exhaust work on the C63.

BO Knows

Only Evolution exhaust system are straight pipe (which I have) and LT headers won't fit without custom weld fittings. I'm running into this problem.

bluejae

they have a catback only set up just like the pro-1... so i shouldn't run into issues there...

the reason i brought up the akrapovic was that they decided to go straight pipe without some kind of balancer (x or h pipe)...