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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Best Quad Tips!



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      05-01-2008, 11:43 AM   #45
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Quote:
Originally Posted by Revo Performance View Post
I have Cybas diffuser already fitted to my bumper... but waiting for the same tips as Rugs.

Bumper hasn't been mounted back to the car. Will do that when the tips arrive - hopefully by next week.

And by then, one of you should have the solution for fitting the tips


Cyba: I haven't gone back to the bodyshop to take pics - it's holidays here til Monday.

Quote:
Originally Posted by Fubarsky View Post
Rugs
I'm doing the same thing with Cyba's quad diffuser just like yours. I have not installed mine yet as I am waiting on the quad tips from RennArt. I would be interested in seeing your cut out prior to installing the diffuser and how you handle the lower bumper supports. I will post pictures of mine if I get it done first for you, but one of us will be first and it could be helpful to the other.

Peace/out
This is a cool project and I am considering it myself. Are you guys doing the cuts yourselves?
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      05-01-2008, 11:51 AM   #46
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      05-01-2008, 11:52 AM   #47
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MY bodyshop cut the bumper. Looked pretty straight forward.
The outer sides of the diffuser runs with the stock cutout on the bumper, so you just cut out on the inner sides.

The diffuser hides the work on the bumper.
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      05-01-2008, 02:42 PM   #48
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Were you able to or are you going to be able to keep the two lower bumper supports in place? Cause it looks close based on the cut needed. Or do you remove them with extra structural the diffuser gives? Send some pics if you can. I think the tip issue is going to involve getting a pair that is close and having a muffler shop do the final mods and fitment. I can't wait to get mine and put it together. I was going to install the diffuser and just run with the singles till I get the quad tips but I couldn't hang with the look, so I am waiting.
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      05-03-2008, 12:34 AM   #49
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Quote:
Originally Posted by Fubarsky View Post
Rugs
I'm doing the same thing with Cyba's quad diffuser just like yours. I have not installed mine yet as I am waiting on the quad tips from RennArt. I would be interested in seeing your cut out prior to installing the diffuser and how you handle the lower bumper supports. I will post pictures of mine if I get it done first for you, but one of us will be first and it could be helpful to the other.

Peace/out
Here ya go. For the diffuser to fit flush with the rear bumper I had to make a cut between the tail pipe openings just below the crease, cutting the lower/middle part of the bumper out.




Here is the material I cut from the bumper....


This is also necessary if you don't wont the bumper showing through the lower horizontal diffuser vent.


The lower bumper mounts or brackets have to be bent in toward the middle of the car to clear the Quad pipes & reach the new position of the Diffuser. Here circled in Red is the original position of the lower bumper mounting brackets before I bent them inward. Also pictured with the 4" tailpipes before Quad Tip install.



A Dremel Tool works Great for making these cuts quick work. I used their new 1 & 1/2" "EZ-LOCK" Plastic cutting wheel.
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Last edited by Rugs; 05-03-2008 at 01:45 PM.
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      05-03-2008, 01:02 AM   #50
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Quad Tips Installed

The installer at the Muffler shop did a Great job. Here's some pics I'll post some install pics latter(it's getting late). I just had the diffuser taped on w/ double stick tape(for photos only) until I get some Betalink, so it's not sitting as flush as it will when it's permanently mounted.






w/out Diffuser to show how the bumper was cut...
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Last edited by Rugs; 05-03-2008 at 01:47 PM.
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      05-03-2008, 01:12 AM   #51
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wow.. that looks really good
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      05-03-2008, 08:08 AM   #52
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looking yummy!

As you guys know, I prefer the 335s (save the quads for the M car) with big 3.5 or 4 inch round dualies...but this one one heck of an execution of a very nice mod!

Awesome work, great post, very very informative!
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      05-03-2008, 08:51 AM   #53
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Looks damn good. This might be next on my list.
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      05-03-2008, 10:32 AM   #54
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Rugs it looks great, nice job. Thanks for sharing your project with some excellent photos, now I can proceed with that extra bit of confidence. I just need my quad tips now. Cyba does an excellent job with the CF.
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      05-03-2008, 12:56 PM   #55
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Great job.
Please post somd pics to show how your muffler guy attached the quads.

Were you able to retain the exhaust valve?
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      05-03-2008, 04:16 PM   #56
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Quote:
Originally Posted by Revo Performance View Post
Great job.
Please post somd pics to show how your muffler guy attached the quads.

Were you able to retain the exhaust valve?
YES!

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      05-03-2008, 04:57 PM   #57
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Did they alter the quads?
Can you let us know what the muffler guys did when welding the tips onto the stock exhaust?

thnx
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      05-03-2008, 07:09 PM   #58
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could you estimate a total cost for this mod? cuz i am wondering if it is worth it...
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      05-03-2008, 10:08 PM   #59
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      05-03-2008, 10:52 PM   #60
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Quote:
Originally Posted by Revo Performance View Post
Did they alter the quads?
Can you let us know what the muffler guys did when welding the tips onto the stock exhaust?
thnx
The only alteration he made to the Quad tips was cutting 3/8's to 1/2" off the Single inlet side(Red Line in pic) the Quads inlet pipe diameter gets larger as it gets closer to the "Y" for the quad tips.
He did this for Two reasons:

1) So the tips would fit Over the stock pipes coming from the muffler because they were the Same Diameter.
2) For length adjustment.


Another point of interest is how he aligned the pipes coming out of the Mufflers.
Pic below: is a crude illustration of how he had to cut the pipes just after the mufflers, then pulling them inboard and rewelding to align them for the quads.



Drivers side: He was able to retain the exhaust valve. He cut 7/8's of the way through the pipe(circled in Red), bent it in toward the center of the car so the quad tip would line up. Then filled in the gap with the welding torch (pic is with the old tip still on just before he cut it off).


Close-up of the cut just after the muffler(drivers side)...


After the cut was filled in with a weld.


This is the same pipe & weld from the other side. You can see here (circled in Red) where (the pipe is entering the muffler) he left just enough material on the pipe to be able to bend it into place without cutting the pipe entirely off.

He finished it off by spraying a light coat of 500 degree Silver paint to keep the welds from rusting...
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Last edited by Rugs; 05-03-2008 at 11:38 PM.
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      05-03-2008, 11:51 PM   #61
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Quote:
Originally Posted by aut0sh0cker View Post
could you estimate a total cost for this mod? cuz i am wondering if it is worth it...
$250.00 including shipping / C.F. Hamann Style Diffuser by cyba:http://www.e90post.com/forums/showthread.php?t=108172
$109.95 for Assured Automotive's 4x76mm Staggered, Slanted & Beveled Double Wall Quad Tips: http://assureda.startlogic.com/ACDDW2251D2TIP.html
$14.95 Shipping
$140.00 Install & Labor @ "Mighty-Muffler" 2+ .
$514.85 Total Installed...or $374.85 before install which isn't bad considering: Eisenmann axle back 4x76mm Quads are $1,998.00. Bastuck axle back 4x76mm Quads are $1,675.00 and ilia Industry quoted me $500.00 for just the Eisenmann Quad Tips!
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Last edited by Rugs; 05-04-2008 at 12:09 AM.
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      05-04-2008, 07:31 AM   #62
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Looks nice. Do you have any pictures that arent taken directly from behind the car? Maybe slightly off to the side and zoomed out some? I dont know if Im feeling the peep hole or not.

Also, did he fill that gap all with weld?

This is a dumb question, but something I've always wondered. Ive never sat there and watched a muffler shop weld up the pipes. How in the hell do the weld up OVER the tops of the pipe? It doesnt appear that there is any room to get up in there.

I can MIG all day long but have never done an exhaust. Do I need a special gun with an angled tip or something?
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      05-04-2008, 07:52 AM   #63
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Quote:
Originally Posted by Rugs View Post
$250.00 including shipping / C.F. Hamann Style Diffuser by cyba:http://www.e90post.com/forums/showthread.php?t=108172
$109.95 for Assured Automotive's 4x76mm Staggered, Slanted & Beveled Double Wall Quad Tips: http://assureda.startlogic.com/ACDDW2251D2TIP.html
$14.95 Shipping
$140.00 Install & Labor @ "Mighty-Muffler" 2+ .
$514.85 Total Installed...or $374.85 before install which isn't bad considering: Eisenmann axle back 4x76mm Quads are $1,998.00. Bastuck axle back 4x76mm Quads are $1,675.00 and ilia Industry quoted me $500.00 for just the Eisenmann Quad Tips!
that's a good mod, but complicated as far as install and mod. you really lucked out, the price and the work that your muffler shop did is to be commended.

awesome execution!
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      05-04-2008, 08:24 AM   #64
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Rugs, great write up, great photos, etc. This is a semi-DIY since you engineered it and figured it out yourself. Quads look great!
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      05-04-2008, 08:57 AM   #65
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Quote:
Originally Posted by foxman View Post
Rugs, great write up, great photos, etc. This is a semi-DIY since you engineered it and figured it out yourself. Quads look great!
+1
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This looks PERFECT!
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      05-04-2008, 10:48 AM   #66
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Thanks for all the info! I'm waiting for mine to come in and I'll be printing out ur photos as illustrations to my exhaust shop!

Kudos!
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