Keep the Cat on, & get an exhaust with a resonator in addition to the muffler. FWIW, my Buddy's Evo w/ Vishnu's Non-Sig was not appreciably louder to me when we compared before & after. Slightly deeper idle in tone. Not Raspy.

Also a Turbocharged vehicle will be quieter than a comparable naturally aspirated vehicle with the same exhaust.

 

I have the same concerns. I want more power , but do now want to be a lot louder. What other options do I have to gain power, but not loudness. Thanks for the help.

 

I hate to flame but it will...Pat your selves on the back all you want an evo will need MORE power than either of those cars to stand a chance if you go from 75+ mph

WHY?

because after 100 mph areo dynamics become 3 times more important than power the evo is a brick, with a wing designed FOR drag M5 & E55's have a much more areo dynamic shapes than an EVO.

Also and E55 has 469 hp to have a chance in an evo you will need at least 550 because of the shap of the car. Also power to weight ratio means alot less when all of the weight is already going at free way speeds.

check how fast all of these cars get to 155 or how fast they get from 100 to 155

Its 21 seconds in a 996tt
19 in an E55

the evo barley gets there, EVER.

and evo puts up great 0-60; 1/4th mile, 0-100 times because it has all wheel drive hooks up like no ones business and is really light relative to other cars. no of this will help on the freeway.

 

where is that BS flag icon I have seen?

this was from a stop, no from an 80mph roll here you have a chance.

stage 1 has what maybe 375 hp how do you beat a car that doesnt have to wait for its turbo to spool and has more power than you with this set up? and exactly how 375 hp could beat 493 is beyond me.

 

You're thinking of a different car the E55 has the 469 hp engine and the CLK55 has a 362 hp engine.

See models here:

E55:http://www.mbusa.com/brand/container...&modelCode=E55
CLK55:http://www.mbusa.com/brand/container...delCode=CLK55C

 

damn it you are right i got so caught up in thinking of jokes about "stage buy a faster car to start with" or "stage: in one set of circumstances if faster" that I crossed the original claimed power for the SL55 with the e55.

I hust got annoyed because I am fairly sure i have seen 9000 threads on the SRT forums about how they can beat an evo from a roll with mods. We laugh at them and then say things like this?

 

and to add 10 lbs does not equal on HP if I take 300 lbs out of my car it will be slow the an evo with 300+ hp

take my carrera 2600+ lbs power between 255-270 10 to 1 power to weight ratio, still slower (barely) than the evo which is around 12 to 1 (feel free to correct me their did it in my head)

 

To an extent there's some truth to that statement. A modded SRT can beat a stock evo in a roll on. Depends on the $ spent.

BUT:
1. Not from a dead stop.
2. Not around corners
3. Not in braking.

 

still begs the uestion though stage what can we get the needed 500 hp out of this car?

 

You make an excellent point about aerodynamics being a huge factor, the Evo being crippled by a 0.36Cd vs. the E55's .028Cd (wow).

How do you figure? Freeway speed or not, the E55's engine still has to motivate 4100+ pounds to vs. the Evo's 3250+.

 

stage 2 would do it!
Ridden in one and pulls like crazy.

http://www.vishnutuning.com/lancer_stage_zero_2.htm

 

So ignoring gearing and frontal area factors (which are probably significant), it looks like our Evos would have to be making at least 30% more torque per unit weight to counter effects of drag vs. the E55?

 

it requires much less force to move an object that is already moving that it does one that is stationary so this helps to negate the weight diffence.

 

true enough, i guess we're only talking about potential differences of a hundred pounds of force in rolling resistance or so