Flex pipes; Instead of 1st Cats?
Thread Starter
Super Member
Joined: Oct 2009
Posts: 923
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From: Jacksonville, Florida
2006 E55 AMG --old cars -- E39 M5, 2.7tt Audi S4, E36 M3 **Ducati 996, 748
Flex pipes; Instead of 1st Cats?
I think I will do this... but as a somewhat smart person -- I will seek some feedback first.
First, I had a friend with full Supersprint headers + no cats & resonators but retained OEM mufflers... I thought the sound was decently tame until he floored it... So, this mod should not be annoying for me.
I was just curious about shopping for flex-pipes. Seems like a good idea for our torque monsters... I also figured using slip-ons will be an easy DIY. I can just cut off the CATS and slip-on and clamp the flex-pipes.
* Florida doesnt SMOG - and I am not concerned about a check engine light
Is this really as easy as that??? what diameter flex-pipes should I be shopping for? 2 3/4 inch??
Any feedback would be appreciated.
First, I had a friend with full Supersprint headers + no cats & resonators but retained OEM mufflers... I thought the sound was decently tame until he floored it... So, this mod should not be annoying for me.
I was just curious about shopping for flex-pipes. Seems like a good idea for our torque monsters... I also figured using slip-ons will be an easy DIY. I can just cut off the CATS and slip-on and clamp the flex-pipes.
* Florida doesnt SMOG - and I am not concerned about a check engine light
Is this really as easy as that??? what diameter flex-pipes should I be shopping for? 2 3/4 inch??
Any feedback would be appreciated.
Member
Joined: Apr 2012
Posts: 192
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From: Houston, Tx
2006 W211
Flex Pipes
I used 3 inch piping and flex pipes where i cut off my primary cats.. runs real good and sounds great. originally i didn't put the flex pipes and when i got on it the pipe actually hit the floorboard. I have headers no cats and kept my resonator some ppl delete the resonator also but i think it sounds great the way it is now. But flex pipes are a must!
Super Member
Joined: Mar 2007
Posts: 946
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From: Bay Area
03 C32 gone, 06 CLS55, 16 Tesla X
I got flex after my prime high flow cats and my header is still cracked
So it must be better to have flex closer to the headers
.
Smooth pipe = performance (almost none lol)
Flex = safety (free of mind)
So it must be better to have flex closer to the headers.Smooth pipe = performance (almost none lol)
Flex = safety (free of mind)
Thread Starter
Super Member
Joined: Oct 2009
Posts: 923
Likes: 0
From: Jacksonville, Florida
2006 E55 AMG --old cars -- E39 M5, 2.7tt Audi S4, E36 M3 **Ducati 996, 748
Thanks for the feedback ---
So, what is the diameter of the piping? I dont think its 3 inch.. 2 3/4 or 2 1/2 is my guess..
Like I said I want to pick up some flex pipes probably order from Summit. Cut out the Cats = slip and clamp
So, what is the diameter of the piping? I dont think its 3 inch.. 2 3/4 or 2 1/2 is my guess..
Like I said I want to pick up some flex pipes probably order from Summit. Cut out the Cats = slip and clamp
Thread Starter
Super Member
Joined: Oct 2009
Posts: 923
Likes: 0
From: Jacksonville, Florida
2006 E55 AMG --old cars -- E39 M5, 2.7tt Audi S4, E36 M3 **Ducati 996, 748
i measured the Circumferance of our piping 9 inches
D= 2.8inches 'outside edges' --So, 2 3/4 inch piping...
Right before the cat the piping expands C= 11 inch, D=3.5inches 'outside edges'..
So, I guess the best option would be to cut where its 11inchs -- slip 3inch flexpipes into the piping til it hits the taper into 2 3/4 inch -- and clamp it down -- Seems like it would make a good sandwhich -- will this work?
Or must I ditch the slip-on bolt down flexpipe idea and get a muffler shop to weld it?
D= 2.8inches 'outside edges' --So, 2 3/4 inch piping...
Right before the cat the piping expands C= 11 inch, D=3.5inches 'outside edges'..
So, I guess the best option would be to cut where its 11inchs -- slip 3inch flexpipes into the piping til it hits the taper into 2 3/4 inch -- and clamp it down -- Seems like it would make a good sandwhich -- will this work?
Or must I ditch the slip-on bolt down flexpipe idea and get a muffler shop to weld it?
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Thread Starter
Super Member
Joined: Oct 2009
Posts: 923
Likes: 0
From: Jacksonville, Florida
2006 E55 AMG --old cars -- E39 M5, 2.7tt Audi S4, E36 M3 **Ducati 996, 748
Update - just kept it easy and had it straight piped. Sound is just as i figured.. a tad more sound - not raspy or drone -- just a little more muscle. I am happy.
Only regret: should have had all the cats and res deleted @ the same time--- would have saved some money.
Only regret: should have had all the cats and res deleted @ the same time--- would have saved some money.
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