i have a question about buying a cat back over just buying a new muffler, is there a reason why you need to change all that piping between the cat and the muffler, it looks fine to me

 

Bigger diameter = speedier flow = more hp

If you shoot for looks, an axleback is right up your alley

Now if you look for performance, a catback is the way to go...nothing bigger than 2.5 inches unless u are going turbo

 

But I feel like I lost some torque with my RRM axleback... and can't stand the sound on the highway.

I'll do some test to confirm my thought.

 

My axleback is quiet on the highway...I forget I even have it until I start to get on it.

 

u lose lowend tq for high end hp.. good sacrifice for top end power (drag) but not good for mid range power (autox, anything with turns)

 

your sig says CAI only. you lost more torque with your CAI. there is little to no need to replace the factory muffler without first addressing the other restrictions in the system. unless you have done more modifications than you have declared in your sig your butt dyno needs to be calibrated.

 

udp solves low end tq. so does sri

 

hmm, he has the CAI already, so that didn't help, and he doesn't have the UDP either

kreepa had it pegged man, for looks buy whatever you want, for power your CBE is a plus, but do some research before you decide. at the very least, crawl around under the car and look at the exhaust, you will find some unpleasant surprises down there

 

2.25" is recommended for NA

 

In my experince..I actually lost 1 ft pounds of tq with the UDP and a gain of 5 hp(freed).... but initial acceleration...first 3 gears, go really easier and smoother...way smoother with the UDP...its a smoothness you can actually feel as you accelerate from a stop or a 5 mph roll

 

if you can't back that up with before and after dynos, done on the same dyno with the same other modifications, with local temperatures for both runs on the printouts, then you are 100% full of ****.

there is no question in my mind that you have no way to back this up, nor are you correct in what you say. it is physically impossible, not just improbable but impossible due to the laws of physics, for you to have lost any power from changing your heavy steel stock pulley to a lightweight aluminum one. you are wrong. period. do not bother posting a response unless you include the appropriate supporting documentation, you would be arguing against every single person with an iq over that of a bullfrog that would even bother reading your post more than once to verify you are really saying what you said.

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If you are saying it to me... I dont have the second UDP dyno i do have the first one...It was an inertia dyno...and I knew you would explode against me(hence the (freed) little quote) And you know why that happens...just didnt feel like explaining

Initially 167 hp and 166.7 tq > Injen CAI, RRM DP..nothing else

UDP HP > 171.5 hp 165.8 tq > Injen CAI, RRM DP, UDP

Once again, I dont have the graph for the 171 hp dyno, lost it when moving..I wasnt fast scanning it like the first one

...happy?

 

No need to insult me. It is what it is, if you dont believe it, fine. Nothing more I can do

And theres no way that Temperature, humidity and conditions can be the same on two different days, two months apart... U are beeing irrational there yourself

 

no, what were the temps. was this the same dyno? especially on an inertia dyno you should have seen a difference. this lost it when moving thing aint gonna work either. take it off, dyno the car, put it back on, dyno the car, post your graphs and I will believe you. until then, please do some reading on physics, especially rotational inertia. you can't be right, or the laws of physics have been broken.

 

no, of course it won't be, but if you know the conditions are different then the numbers will be different.

add dynamometers to your list of research please, so you don't sound rediculous. I'm not trying to insult you, but this is ludicrous man, you can't just make claims like this