Author Topic: High Flow Cat or Down Pipe (Read 7469 times)

Brazen17 · « **on:** January 20, 2012, 04:04:18 PM »

Can anyone give me some info on how much louder the GXP is with a high flow cat or down pipe? I am running a magnaflo exhaust system.

RufusMacblorf · « **Reply #1 on:** January 20, 2012, 04:24:14 PM »

I have a Solo high-flow cat with a Magnaflow. It's a little louder than with the stock cat, but not unpleasantly so. From the cabin, it seems about 25% louder. The Magnaflow emphasizes the low frequencies, so the noise increase might be a lot more obnoxious if you had a higher-pitched exhaust.

IBDRINKEN · « **Reply #2 on:** January 20, 2012, 05:17:44 PM »

I had the solo downpipe and the hi flow cat along with the race exhaust and it was def loud.

miller11386 · « **Reply #3 on:** January 20, 2012, 07:29:51 PM »

If you need a HF cat, mine is for sale!

Street race and HF cat was my last setup. it was pretty loud. With the magnaflow it will be considerably less loud than mine. So if you want more noise from your magnaflow, slap on the HF! If you buy a used one you can always resell it

snaponbob · « **Reply #4 on:** January 20, 2012, 08:05:15 PM »

I've run a stock Redline with the Magnaflow, and it was not much louder than stock but sounded great. Once I moved into SP class, I installed a downpipe with the Magnaflow. "Loud" is similar to "beauty is in the eye of the beholder". It was still well under SCCA dB maximum limits. For the last couple of year I have run a downpipe into a full 3" Solo Performance single pipe system with only a 14" open S.P. resonator. STILL under SCCA dB maximums, but is louder for sure. But, if I am not mashing the gas, it's fine. Keep in mind, on the LNF engines the turbo is a VERY effective muffler in its own right. If it was a 2.4 with the same exhaust it would be a skull crusher.

cdflint · « **Reply #5 on:** January 20, 2012, 08:46:14 PM »

For me, Solo HF cat recently installed with a magnaflow exhaust, I find the loudness is mostly on starting the car. Once it settles in (few minutes) its a perfect low rumble on the drive. Compared to Stock, yeah its louder but in a better way and not annoying to my neighbors (too much)

elff · « **Reply #6 on:** January 20, 2012, 09:30:42 PM »

I have the solo hi flow cat and magnaflow.
I love it. Sounds awesome and is not too loud

I thought the magnaflow with the stock cat was a little too quiet.
Now it's like a tuxedo tshirt.
It's all business but is also ready to party

miller11386 · « **Reply #7 on:** January 21, 2012, 12:11:20 PM »

Quote from: elff on January 20, 2012, 09:30:42 PM

Now it's like a tuxedo tshirt.
It's all business but is also ready to party

Best statement about this exhaust combo ever

. Very true!

elff · « **Reply #8 on:** January 21, 2012, 12:18:38 PM »

miller11386 · « **Reply #9 on:** January 21, 2012, 12:55:16 PM »

Tuxedo T- Shrit Jesus

elff · « **Reply #10 on:** January 21, 2012, 01:32:04 PM »

love that scene

Carbon Sky · « **Reply #11 on:** January 21, 2012, 01:32:15 PM »

I'm a big fan of the stock Redline tips. Due to my tune, it's a little rich on tip in (just a little safety and lessens KR, and even helps to take out a little lag), and no cat, my tips are always darkened. And on the stock tips, it looks badass.

Anyways, if I wanted to go with a magnaflow muffler with the stock tips, does magnaflow sell just the muffler? I'd weld it in myself.

elff · « **Reply #12 on:** January 21, 2012, 01:44:07 PM »

They sell mufflers in all different shapes and sizes. I have an oval one on my jeep that is really small so i could tuck it up tight and out of the way of my upper control arm

spicy3480 · « **Reply #13 on:** January 21, 2012, 05:44:52 PM »

A HF cat will make the exhaust about 20% louder. The catless downpipe is more in the range of 30-35%.

Brazen17 · « **Reply #14 on:** January 22, 2012, 12:36:33 AM »

Thanks to everyone for posting. I am not looking for something that will be very loud. Increased performance (for my not so distant Trifecta tune) with a little rumble is fine. What I don't want is something that will be heard a mile away...and draw "unwanted" attention!

Arabas · « **Reply #15 on:** January 22, 2012, 04:31:28 AM »

Quote from: Brazen17 on January 22, 2012, 12:36:33 AM

Thanks to everyone for posting. I am not looking for something that will be very loud. Increased performance (for my not so distant Trifecta tune) with a little rumble is fine. What I don't want is something that will be heard a mile away...and draw "unwanted" attention!

Brazen, IMHO a solo HF cat with stock exhaust is the best combination for a nice rumble and just a little bit of noise.

johnnys · « **Reply #16 on:** January 22, 2012, 10:40:20 AM »

Quote from: Arabas on January 22, 2012, 04:31:28 AM

Brazen, IMHO a solo HF cat with stock exhaust is the best combination for a nice rumble and just a little bit of noise.

+1

1LILNDN · « **Reply #17 on:** January 22, 2012, 11:35:28 AM »

Quote from: Arabas on January 22, 2012, 04:31:28 AM

Brazen, IMHO a solo HF cat with stock exhaust is the best combination for a nice rumble and just a little bit of noise.

Quote from: johnnys on January 22, 2012, 10:40:20 AM

+1

(Must be all that Water over there that carries the Sound so well .I have a Solo H/F Cat and Magna Flo Exhaust but not Installed Yet. A little Snow set me back

elff · « **Reply #18 on:** January 22, 2012, 12:05:08 PM »

yea sorry about the snow.
My fault.

1LILNDN · « **Reply #19 on:** January 22, 2012, 12:29:30 PM »

YEP the devel's doings ( I knew That ) YOU little

Brazen17 · « **Reply #20 on:** January 25, 2012, 08:11:55 PM »

For those of you with a high flow cat, which one do you have and how is it holding up. Seems a few years back there was one that was not lasting very long but I can't remember who made it. Correct me if I am remembering incorrectly. I know MRZ and Solo make one. Anyone else?

elff · « **Reply #21 on:** January 25, 2012, 08:25:29 PM »

Solo
No issues
Love it

miller11386 · « **Reply #22 on:** January 25, 2012, 08:58:09 PM »

Solo HF cat has not had any failures at any mileage as far as i know.

And I love my Solo HF

Too bad all good things come to an end!

MARVIC 1 · « **Reply #23 on:** January 25, 2012, 09:05:13 PM »

Quote from: Brazen17 on January 25, 2012, 08:11:55 PM

For those of you with a high flow cat, which one do you have and how is it holding up. Seems a few years back there was one that was not lasting very long but I can't remember who made it. Correct me if I am remembering incorrectly. I know MRZ and Solo make one. Anyone else?

Performance Autowerks also makes them.... (Werks)

I think around a year ago, someone had an issue with the Solo HF cat. They claim that it blow their engine.. Check with the Kappa forum's by searching for details or someone can charm in on this situation....

miller11386 · « **Reply #24 on:** January 25, 2012, 09:13:03 PM »

They corrected themselves later that it was not the cat that did it.......

Here is the thread: http://www.skyroadster.com/forums/f25/engine-failure-38042/

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Author Topic: High Flow Cat or Down Pipe (Read 7469 times)