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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 > catless DP's on a stock car with jb4, how much whp gain? How hard install?



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      12-28-2011, 01:57 AM   #1
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catless DP's on a stock car with jb4, how much whp gain? How hard install?

For an average man with decent set of tools/power tools, no lift, how long should it take to install catless dp's? With the car being stock besides a jb4, only have 91 octane, would be on either map 1 or 5, what would be the apprx whp/tq gain?
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      12-28-2011, 02:24 AM   #2
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Allow 3-4 hours for first time since youll want to go slow
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      12-28-2011, 02:42 AM   #3
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Ok, any idea on hp/tq on stock car with jb4 on map 1? Estimates?
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      12-28-2011, 02:45 AM   #4
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91 oct on map 1 would yield from 15 to 25 whp depending on which size d.ps's you get !
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      12-28-2011, 02:51 AM   #5
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Definitely worth the mod.... Not worth the time... It's a pain in the ass... If you can get it Installed for less than $200 pay it!
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      12-28-2011, 03:05 AM   #6
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^ I only make 23/hr at my job, so if it only took me 4 hrs, that would be $100 worth of labor money that i would be saving myself . That would buy me some lowering springs heheh. I do recall looking under there previously though, it DOES look like a PITA. 15-25 whp sounds like a good amount for this mod..
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      12-28-2011, 10:12 AM   #7
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I believe there is a DIY on how to do it. I am debating to since my warranty is up in 150 miles. I hate the 91 piss water gas.
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      12-28-2011, 10:20 AM   #8
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Quote:
Originally Posted by DrivinMissDaisy View Post
I believe there is a DIY on how to do it. I am debating to since my warranty is up in 150 miles. I hate the 91 piss water gas.
Gas sucks in CA. But you don't have salt, potholes, and you've got access to racetracks everywhere anytime

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DP DIY
http://www.e90post.com/forums/showth...=DP+DIY&page=3
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      12-28-2011, 10:34 AM   #9
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There is salt where i live, in the mountains, but I have 2 race tracks within a hour of me.
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      12-28-2011, 10:43 AM   #10
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Quote:
Originally Posted by CalBear_335i View Post
Definitely worth the mod.... Not worth the time... It's a pain in the ass... If you can get it Installed for less than $200 pay it!
THIS




Its a bitch without a lift. Stock you will gain 5hp. Tuned you will gain 4x that.
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      12-28-2011, 11:05 AM   #11
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Give yourself 5 hours the first time. It's not too bad. I actually prefer not using a lift for DP installs - it's more comfortable on your back.
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      12-28-2011, 11:58 AM   #12
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Yea 91 oct is horrid.. And thank you everyone for the info, i will probably do it myself one of these nice warm days. Will it change the stock exhaust note any? I thought about removing the front and rear cats and leaving the rest stock. How would that sound?
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      12-28-2011, 01:22 PM   #13
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Quote:
Originally Posted by CalBear_335i View Post
Definitely worth the mod.... Not worth the time... It's a pain in the ass... If you can get it Installed for less than $200 pay it!
+1 I know it goes faster the 2nd time around, however, it's still a pain in the ass especially if you have big hands/arms. Give yourself 4+ hours, a stock-pile of beer and pizza and take a muscle relaxant afterwards
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      12-28-2011, 01:38 PM   #14
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Nivedh installed mine a few weeks ago. The sound is the most noticeable on cold starts (see video) and at WOT. Other than the DP's, Tune, and DCI's the car is stock.


Adam

FYI (car feels much different after the mod, all in a good way)

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      12-28-2011, 01:40 PM   #15
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You will have blood rush to your head and get headaches and blured vision occasionally if you stay down there to long on your back. On ramps getting to some of the screws is a bitch especially the midpipes brace you need to loosen up to push the exhaust back for clearance to get the oem dps out. Not fun but can be done. I did it once and will never do it again. I rather pay someone.
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      12-28-2011, 01:49 PM   #16
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Did it in under 3 hrs the first time. Way easier after you've already done it once.
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      12-28-2011, 05:08 PM   #17
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Ive been putting off DP install because everyone says its not that easy and takes a lot of time...

Any tips that anyone can help with that will help me doing it in my garage? Without a lift..?

What I am asking is if there are any specific steps or areas extremely difficult to reach because your doing it on the floor vs on a lift...Also if any other tools not listed on the DIY that are recommended to make the process easier..?
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      12-28-2011, 05:46 PM   #18
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Quote:
Originally Posted by rooringhusky View Post
Ive been putting off DP install because everyone says its not that easy and takes a lot of time...

Any tips that anyone can help with that will help me doing it in my garage? Without a lift..?

What I am asking is if there are any specific steps or areas extremely difficult to reach because your doing it on the floor vs on a lift...Also if any other tools not listed on the DIY that are recommended to make the process easier..?
If your mechanically inclined, its not that bad.
If you are interested, I'm willing to HELP you tackle this project.
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      12-28-2011, 09:35 PM   #19
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I am debating about doing this. I have access to lift so that will make things easier.
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      12-28-2011, 10:45 PM   #20
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Ive done the job twice in the last couple of weeks. Still a PIA to do. And yes, I hate those rear support brackets too!
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      12-28-2011, 11:11 PM   #21
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Quote:
Originally Posted by rooringhusky View Post
Ive been putting off DP install because everyone says its not that easy and takes a lot of time...

Any tips that anyone can help with that will help me doing it in my garage? Without a lift..?

What I am asking is if there are any specific steps or areas extremely difficult to reach because your doing it on the floor vs on a lift...Also if any other tools not listed on the DIY that are recommended to make the process easier..?
No real tricks. When you add up the amount of screws and bolts, it's not bad at all. Would think it can happen fairly fast. Where the pain comes in is the clamps and awkward position to install these things. Done it twice. Racelands in and out. Now I have my AR's and I'm trying to decide if I do it once more or pay for the install. Wondering if installing 3" makes it more difficult or is it easier as AR's have perfect fitment.
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