Most liked posts in thread: The Group4Autosport Progress Thread

How is the subtle R53 exhaust coming along?

I have a borla race and i am hoping to upgrade and quite down some at the same time.


-Jonathan

 

The new 2 1/4" system is ready for sale and the new mufflers for the 2 1/2" are ready for a quieter system. Depending on how much power you want to add and how quiet you want.
Both systems have a real nice tone and are easy to install at home.

PM me for interest.:drool

Mark

 

Pics of this system?

 

There is a comparison of a stock system and our system on our web site "Group 4 Autosport.com". The site is not fancy but effective, enjoy.

 

And that clears the MCS battery box, or does that have to be modified, too?

 

They make one with a bend in the pipe that clears the battery box. Otherwise, you can get one that's straight, but it requires some work on the battery box.

I had this setup, but I'll warn you, with a header and BVH, it's loud. Which sucks, because now I can't use the rear diffuser; it won't clear twin cans. On a stock MCS or JCW, the straight exhaust should be just fine.

I still have the magnaflow up front, and took the 2.5 pipe back to the split in the JCW exhaust, where it comes down to 2.25, so I lose a little (but you're going to lose a little with the bend for the battery box anyway). Anytime you get rid of the split and go to a straight pipe, expect more noise. As long as you're stock, or close to stock, you're fine, but if you have, or are thinking of getting a BVH/Header combo, I'd strongly recommend a split exhaust if you drive on the street. Track only car, that would be different.

Mark, got the splitter on, still have some fine tuning to adjustment, but it came out nice.

Now just get me that wing!

 

I've got a Madness exhaust, but stock headers. Of course, until I win the lottery, the Family CFO would nix any project, so for now, it's all just info to be filed for future use.

 

With the new 2.25" system and new design mufflers we are getting rid of the noise and drone problem.

The slight bending to go under the battery box we are still getting 10 to 12hp gain, real hp.

The 2.5" system produces more hp but as stated by wise MINIacs there is more noise. You have to give a little to get a lot.

The wing is in final development and I should have word soon. It's taking longer then expected but we want to get it right. :drool

Mark

 

Wingsss:drool

 

What kind of effort goes into installing the splitter? Is there a soft copy of the installation instructions anywhere? I've looked around and not had any luck finding anything.

 

Are they still in business

 

Group4? Yes, I talked to Mark V at MOTD...expressed interest in doing wing designs for them...I have the background and design equipment...we'll see...

I love to have their diffuser but don't really want to modify my exhaust to "single" muffler...it's loudass enough lol...but I might not have a choice if I go this route in the future since even the small Borla mufflers would intrude into the tunnel...hmmmm.....

 

So Sid
Are u going to take over Joel's position as he has left the group.

 

Look at it as a fill in...

Joel will be back when he isn't preoccupied with his home build...:wink:

 

Joel was missed at breakfast each morning.

I hear that house might take 10 or 12 years to complete. :lol:

Jim

 

I'll have to go check out that mansion :lol:

 

Anyone know if they are building a wing for the Clubman?

 

I want to know when the lower cannards will be done?

 

Check with Mark (Putterfarm). I believe the wing is still on the table, but not sure the status right now.

Jim

 

Glad to see Mark is back at it. Last time I talked with Wayne, they had shelved the rear wing--they were having too many headaches getting parts. Maybe that's changed.

I went with the Orranje rear wing, fubrication makes a nice looking one too, but the Orranje guys are little more track oriented so I went in that direction.

Still have the rear diffuser, which I'm going to hang onto and eventually install, once I can figure out a reasonably quiet straight exhaust.