NorthAlabamaSpyder
New member
Would be interested in hearing any differences in back pressure, sound of the RLS cat delete pipe vs Lamonster's cat delete pipe with the monster baffle installed. Thx in advance
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Back Pressure
- Thread starter NorthAlabamaSpyder
- Start date
krakum1967
New member
I am getting the performance tip for the Two Brothers Exhaust today, its all I can afford this payday. But I have the baffled two brothers with no tip, its LOUD, and I need the tones dropped just a schoonch, its supposed to add power too, I will let you know if the added back pressure helps. The performance tip is basically a torque cone you put in the end of the pipe.
I installed the RLS delete with ceramic coating last spring and put on about 4000mi with it.About the only time I notice it being any louder is in town at low speed and it's not a lot.I can't vouch for any power increase,if there is I'm sure it's minimal.BUT...I did get a 10% plus mpg increase!And heat on feet is noticeably less.A worthwhile mod and with enough miles ridden will pay for itself!
BLUEKNIGHT911
Sadly Passed Oct 2024 - RIP
IMHO BRP has the computer parameters set for a certain amount of Back Pressure. I believe there is some degree of variance built in. ….Ideally any change in the Exhaust system will agree with those parameters. …. I also believe any combustion engine that is COMPUTER controlled will not benefit from what you could do with an engine to increase it's power output.... An engine that functions because of a computer ie. Brain, is not likely to accept changes.... There was a video of DYNO results ( from an Intake and Exhaust company ) that I had suspicions about …. " PMK " gave a nice explanation of how the " DYNO " may not have given a truly accurate picture..... good luck …. Mike 
hyea:
hyea:
NorthAlabamaSpyder
New member
While I truly appreciate all the answers I am really looking to compare the Lamonster pipe vs the RLS pipe. I am having the ECU flashed as we speak and want to open the exhaust up but keep some back pressure. I have the Lamonster pipe now. Ordering a Two Bros exhaust and was thinking of changing to the RLS pipe to go with it.
IMHO BRP has the computer parameters set for a certain amount of Back Pressure. I believe there is some degree of variance built in. ….Ideally any change in the Exhaust system will agree with those parameters. …. I also believe any combustion engine that is COMPUTER controlled will not benefit from what you could do with an engine to increase it's power output.... An engine that functions because of a computer ie. Brain, is not likely to accept changes.... There was a video of DYNO results ( from an Intake and Exhaust company ) that I had suspicions about …. " PMK " gave a nice explanation of how the " DYNO " may not have given a truly accurate picture..... good luck …. Mike
BK, you beat me to the answer. Without an ECU flash the only changes an owner can likely accomplish is looks, sound, weight, heat and handling. With all the modification add-on and take offs the best we can do probably is reduce performance a little rather than increase it. I know I'm going to catch he!! for saying this by some one who just spent $700 on a performance muffler.
308gunner
Member
Adding the RLS pipe...without baffles...combined with the flash..and two bros is a fantastic move...it will sound and perform great...let the la monster pipe go..get the RLS!!
troop
Well-known member
Selling a perfectly good LaMonster cat delete pipe/Monster baffle at a 50% loss to buy a new RLS cat delete pipe makes zero sense. A difference in sound? Certainly, but not in performance. I really need to see some actual dyno results between the two to make that determination. Again, save your money and use what you have..
308gunner
Member
I owned both the la monster and now RLS...the RLS with the resonator....with no additional baffles... surpass the lamonster...the deep tone and increased performance is incredible..and since he's doing the flash it will be even better...he will lose a few bucks by letting go of the la monster...about 100 bucks...no big loss.
NorthAlabamaSpyder
New member
It just got there Friday. Not sure how long it takes. Killing me cause it is going to be 65 degrees here today.
308gunner
Member
65 degrees....perfect...put on a coat...install it..the ECU is plug n play...no break in period...youre going to love it!!!
troop
Well-known member
It just got "there", not back to him.
308gunner
Member
Whoops...my bad...I thought he already got it back...it should be done by Tuesday..back to his house by Thursday.
PMK
Active member
Read what you posted, gave it some thought. Decided I would love to hear your reasoning as to how two cat deletes, neither have baffles, one has a glass pack resonator and the other is a non crimped stainless tube, each nearly identical length and similar diameters...with no other changes, and focusing not on sound but increased performance only, please explain why the resonated straight thru tube outperforms a non resonated straight thru tube.
PMK
Active member
In the past, those running Two Brothers mufflers found them needing the tip restrictor as they were too free flowing.
That said, I suspect that even with the remap flash, and removing the converter, unless you plan to ride at 50% and above throttle at all times, the engine might be better mannered for all around riding with a bit less than full open race pipe.
308gunner
Member
The resonator adds some slight back pressure just enough for the bottom end....a good bottom end kick.. but not too much..to effect your top end, which would be a restriction, which is bad...this is why I DON'T run any baffles..it hurts your top end performance ..the la monster is too free flowing, no back pressure..which hurts the bottom end performance...the resonator reduce the loud harsh sound....it's richer and deeper....also... Both pipes were compared with the flashed ECU...at the 1/8th dragstrip..so I know the extremes of both pipes...the RLS is better.
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