Does this cause me to lose power?

CaliE90 · 08-29-2009, 02:51 AM

Hey guys, not long ago I decided to get a set of aftermarket straight-through magnaflow mufflers with a secondary cat delete and ever since then I felt as if my 335i didnt pull as hard as it used to. Could this have anything to do with the loss of backpressure? By my knowledge, I thought the ridding of backpressure would've been a good thing along with the weight loss from the oem mufflers. I don't have any other performance mods besides scoops as of currently. any thoughts?

CubanJJ09 · 08-29-2009, 07:48 AM

your prob just getting use to it. throw on a tune

Zeph · 08-29-2009, 09:37 AM

look at how many people bought the car and went "whoa" then upgraded to an SSTT/JB+ and went "WHOA" then eventually upgraded to PROcede/JB3 (or other higher power tunes) and again went "WHOA". I don't know if there ever is a point where the power never seems to fall off after some time. The butt dyno needs constant re-calibration!

On a side note, my car did seem to run a little stronger after an HPFP replacement.

AMT92 · 09-14-2009, 10:40 PM

Quote:

Originally Posted by Jz

Hey guys, not long ago I decided to get a set of aftermarket straight-through magnaflow mufflers with a secondary cat delete and ever since then I felt as if my 335i didnt pull as hard as it used to. Could this have anything to do with the loss of backpressure? By my knowledge, I thought the ridding of backpressure would've been a good thing along with the weight loss from the oem mufflers. I don't have any other performance mods besides scoops as of currently. any thoughts?

if anything that should increase your power considering with a F/I setup you want to have as much airflow possible, thus increasing the power. anybody feel free to correct me if i'm wrong, but my friend took out his mufflers and secondary cats on his 335i coupe and our butt dynos definitely noticed a power gain.

orionredwing · 09-14-2009, 11:04 PM

That's cuz your butt had a rest for a day, so you felt the WHOAH again

Quote:

Originally Posted by Zeph

look at how many people bought the car and went "whoa" then upgraded to an SSTT/JB+ and went "WHOA" then eventually upgraded to PROcede/JB3 (or other higher power tunes) and again went "WHOA". I don't know if there ever is a point where the power never seems to fall off after some time. The butt dyno needs constant re-calibration!

On a side note, my car did seem to run a little stronger after an HPFP replacement.

Hecticrulerz · 09-15-2009, 12:15 AM

Quote:

Originally Posted by orionredwing

That's cuz your butt had a rest for a day, so you felt the WHOAH again

+1

kyleb350 · 09-15-2009, 12:19 AM

I have the exact same setup Jz. Do you have the complete Magnaflow system? not that it matters... there should still be at least some gain.

Donald-335i · 09-15-2009, 01:57 AM

bro its time to buy a jb3...

08-29-2009, 02:51 AM	#1
CaliE90 Colonel 354 Rep 2,190 Posts Drives: BMW Join Date: Dec 2008 Location: Worldwide iTrader: (19) Garage List 2021 M550xi [0.00]	Does this cause me to lose power? Hey guys, not long ago I decided to get a set of aftermarket straight-through magnaflow mufflers with a secondary cat delete and ever since then I felt as if my 335i didnt pull as hard as it used to. Could this have anything to do with the loss of backpressure? By my knowledge, I thought the ridding of backpressure would've been a good thing along with the weight loss from the oem mufflers. I don't have any other performance mods besides scoops as of currently. any thoughts? __________________ Retired- '14 F10 535i -- 3 2 1 \| '08 E90 335i -- 4 3 2 1 \|
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08-29-2009, 07:48 AM	#2
CubanJJ09 Banned 169 Rep 12,680 Posts Drives: like an asshole Join Date: Feb 2008 Location: Chicago Burbs iTrader: (2) Garage List 2007 BMW 335i [6.18]	your prob just getting use to it. throw on a tune
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08-29-2009, 09:37 AM	#3
Zeph Major 27 Rep 1,410 Posts Drives: 2008 E92 335i 6MT SGM CR/BD Join Date: Jul 2008 Location: Southeast USA iTrader: (0)	look at how many people bought the car and went "whoa" then upgraded to an SSTT/JB+ and went "WHOA" then eventually upgraded to PROcede/JB3 (or other higher power tunes) and again went "WHOA". I don't know if there ever is a point where the power never seems to fall off after some time. The butt dyno needs constant re-calibration! On a side note, my car did seem to run a little stronger after an HPFP replacement.
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09-15-2009, 12:19 AM	#7
kyleb350 Brigadier General 424 Rep 4,709 Posts Drives: '21 X3MC Join Date: Jun 2008 Location: Milwaukee iTrader: (6)	I have the exact same setup Jz. Do you have the complete Magnaflow system? not that it matters... there should still be at least some gain.
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09-15-2009, 01:57 AM	#8
Donald-335i Banned 191 Rep 3,588 Posts Drives: The Hoes Crazy! Join Date: Nov 2008 Location: Central NJ iTrader: (13)	bro its time to buy a jb3...
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