Running full "straight pipes" ??

Ultimateone · 02-15-2015, 10:53 AM

I don't think it's a 30whp difference but it might be noticeable for sure with a tune.

EVL1 · 02-16-2015, 10:02 AM

When my car was completely straight piped, meaning no cats, resonators or any restrictions, I did lose a lot of torque but not much lost in power it was like 10whp and 30 torque. As soon as I installed a resonator in I went back to the dyno and I got higher power and torque than previous pulls. I also did a custom dyno tune right after that so the power and torque increased drastically

I now have an exhaust cutout about midway through the system and with it open, on the butt dyno, it feels less torquey (if that's how you even spell it). Just loud. But the dump is always closed for racing events, unless I'm at Lime Rock, I want the car to be heard as its coming around the turns

Boosted_N54 · 02-16-2015, 01:49 PM

Quote:

Originally Posted by Silver_Snow

When my car was completely straight piped, meaning no cats, resonators or any restrictions, I did lose a lot of torque but not much lost in power it was like 10whp and 30 torque. As soon as I installed a resonator in I went back to the dyno and I got higher power and torque than previous pulls. I also did a custom dyno tune right after that so the power and torque increased drastically

I now have an exhaust cutout about midway through the system and with it open, on the butt dyno, it feels less torquey (if that's how you even spell it). Just loud. But the dump is always closed for racing events, unless I'm at Lime Rock, I want the car to be heard as its coming around the turns

and I thought going full cattless would gain more power. I am FBO Cobb
Berk race exhaust (delete cat back)
Agency Power race mid pipes that have 2 race cats and catless DP .
did I lose power now? with setup

EVL1 · 02-16-2015, 05:02 PM

Quote:

Originally Posted by Socrates.Tii

Quote:

Originally Posted by Silver_Snow

When my car was completely straight piped, meaning no cats, resonators or any restrictions, I did lose a lot of torque but not much lost in power it was like 10whp and 30 torque. As soon as I installed a resonator in I went back to the dyno and I got higher power and torque than previous pulls. I also did a custom dyno tune right after that so the power and torque increased drastically

I now have an exhaust cutout about midway through the system and with it open, on the butt dyno, it feels less torquey (if that's how you even spell it). Just loud. But the dump is always closed for racing events, unless I'm at Lime Rock, I want the car to be heard as its coming around the turns

and I thought going full cattless would gain more power. I am FBO Cobb
Berk race exhaust (delete cat back)
Agency Power race mid pipes that have 2 race cats and catless DP .
did I lose power now? with setup

Honestly you should be fine with those race cats

WonWunONE · 02-24-2015, 05:18 PM

I'm full 3" catless from the downpipes to the tips.

Here's a video:

There's also a dyno video on my channel.

I think it sounds good

Grinchxvx · 02-25-2015, 09:37 AM

Quote:

Originally Posted by WonWunONE

I'm full 3" catless from the downpipes to the tips.

Here's a video:

There's also a dyno video on my channel.

I think it sounds good

How does it sound from inside the car? I'm about to cut out my secondary cats and try that. I have Catless Downpipes and muffler delete now and you can hear it from inside the car but barely, plus I always have music on

02-15-2015, 10:53 AM	#45
Ultimateone OG E46Fanatic 173 Rep 845 Posts Drives: 24 Champ White CTR Join Date: Dec 2014 Location: Boston, MA iTrader: (4)	I don't think it's a 30whp difference but it might be noticeable for sure with a tune.
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02-16-2015, 10:02 AM	#46
EVL1 Second Lieutenant 20 Rep 273 Posts Drives: Project 1k 135i Join Date: Feb 2013 Location: Canterbury, CT iTrader: (0)	When my car was completely straight piped, meaning no cats, resonators or any restrictions, I did lose a lot of torque but not much lost in power it was like 10whp and 30 torque. As soon as I installed a resonator in I went back to the dyno and I got higher power and torque than previous pulls. I also did a custom dyno tune right after that so the power and torque increased drastically I now have an exhaust cutout about midway through the system and with it open, on the butt dyno, it feels less torquey (if that's how you even spell it). Just loud. But the dump is always closed for racing events, unless I'm at Lime Rock, I want the car to be heard as its coming around the turns
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02-24-2015, 05:18 PM	#49
WonWunONE UMADBRO? 11 Rep 188 Posts Drives: AW 135i Join Date: May 2008 Location: Alberta, CAN iTrader: (0)	I'm full 3" catless from the downpipes to the tips. Here's a video: There's also a dyno video on my channel. I think it sounds good __________________ 2008 BMW 135i Dinan 325whp and 345wtq on a parking lot dyno at 28*Celcius
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