Brochacho

Hey guys,

I did the primary cat delete, and now I'm thinking its alittle too loud. Prior to removing the cat, I have a custom catback with an 1148 vibrant muffler. My question is, which will should better. A nice size magnaflow resonator, or a high flow cat? Any suggestions would be awesome, thanks!

cjandura

iTrader: (3)

Ss magnaflow cat

Brochacho

What's the sound difference between the magnaflow cat, and the stock cat? Any performace differences?

NmexMAX

iTrader: (22)

Probably nothing.

How about a Cattman FastCat?

a33nismo

I've got the warpspeed y-pipe and originally had a test pipe with it and was way too loud also.

I bought the 2.5" magnaflow converter on warpseed's site and the sound is much deeper now and no exhaust drone or rasp. I think i paid like $125 for the converter.

As for performance difference between the two cats it might be slim i was worried about losing power from putting a catalytic converter back on in place of my testpipe but was told the power lose would be minimal compared to a after market convertor if i used a stock converter from nissan i would probally lose some hp.

Also here is a dyno test between factory cat, aftermarket cat (ceramic and metal core) and test pipe. Granted its on a 4 cylinder but still a nice test.

http://www.importtuner.com/features/...l/viewall.html

NoLimitz89

As far as I know, resonators smoothen out the exhaust tone by canceling out sound waves.

Coming from the Honda world, the reason why they all sound raspy and ricey is because they toss the resonator coupled with a straight through muffler.

A resonator is a key component in sound aside from the actual muffler.

If proven to be effective, I would go with a high flow cat and a nice sized magnaflow resonator.

On my 1994 Accord I used 2.25" piping with a regular cat and an 18" resonator and a magnaflow oval chambered muffler. The tone was nice and deep and not ricey at all.

Brochacho

Thanks for all th input guys, I appreciate it it. I also was wondering if not having a cat, will it make it affect selling the car to a dealer? I live in Florida and we have no inspections.

Child_uv_KoRn

iTrader: (7)

If you would have just hollowed it out then no one would ever know.
If they don't look under the car, then it won't Some dealers are stupid lol

Brochacho

Heard gutting a cat is about the worst thing you can do to an exhaust lol. Either way, I think I'm leaning towards the high flow cat.

NmexMAX

iTrader: (22)

Here's my comparison:



I used to always say a test pipe does nothing until I dyno'd.

cjandura

iTrader: (3)

You and your fancy graphs!

NmexMAX

iTrader: (22)

Grabs attention, flashy.

Brochacho

Hmm, I like the looks of that! Is a straight through resonator basically the same thing as a test pipe?

NmexMAX

iTrader: (22)

No that is a test pipe not a resonator.

NoLimitz89

A test pipe replaces the cat in an exhaust system.

A resonator is a pipe that is a bigger diameter than the rest of the exhaust piping. You would use it to smoothen out the exhaust note.

Brochacho

But a test pipe will do nothing as far as quieting my current exhaust. Is that correct?

Zach-R

iTrader: (3)

I ordered a resonated test pipe from warpspeed. Knowing that a test pipe for a 4th gen was 12.5' in length I asked what size the standard resonator was. Only 5' inches. So I requested they use the longest resonator possible. I do not know what that was but It shipped out today (after a week and half wait) so Ill measure before I install. I also plan on making a clip of before and after. It wouldnt have taken so long but they had to order the resonator. Just throwing this out there for those worried about sound levels when wanting to remove the cat.

Brochacho

Thanks for the info Zach, I'm interested to see what your results are. Please keep me up to date when you get it on!

NmexMAX

iTrader: (22)

Left = 2.5" test pipe
Center = 3" Resonated test pipe
Right = 2.75" FastCat

Dyno comparison was with left and right. Recently installed the center piece and it quieted down nicely.

Then again this is a 3" system which is known to throw out all logic. As in a test pipe makes it quieter.

TunerMaxima3000

iTrader: (4)

is it rasp or noise volume?

If it's volume you need a different muffler.
If it's rasp you MIGHT be able to combat it with a resonator but your best bet is an HFC with a 300 Cell count. And a muffler will help also.

There's some really nice OEM mufflers these days, buying aftermarket if you want to tone volume down and keep power isn't always the only route.

NmexMAX

iTrader: (22)

My assumption is it's rasp. That's the first thing to pop up with a 2.5" exhaust and test pipe.

Been through 4 different resonators, and this one helped the most.

Although more of a "race" muffler, it got rid of the rasp.




http://www.summitracing.com/search/p...acing-mufflers

Brochacho

I actually have zero rasp with the exhaust setup I currently have, it's just the overall volume of it is too loud. I really like the note of the vibrant 1148 muffler, I just want it quieter. At the same time I want it louder then it was with the stock cat, any way to get a happy medium?

reddired

i'm wrestling with similar issues.
i have res & cat delete with a magnaflow muff out back.
Tired of the drone, I had my piping reduced down to 2.5" from 3" and it helped, but it also stole some volume.
Nice torque increase though!

I really want a bit more volume, esp at higher rpms.

i imagine that i will swap out my magnaflow, but not sure which muffler to replace it with.
I love the deep tone, but I want the volume too.
my set up is stock w/ res & cat delete.

Finchum

I'm a believer too! I put a test pipe on mine so my car is now cat-free. I felt a big improvement in mid-high rpm range. Also, my gas mileage came up 2mpg.

NmexMAX

iTrader: (22)

Most notable is the torque increase of torque from 3700 - 4200. I see that consistently on every dyno comparison with my test pipe vs cat comps. Seems to be the ticket there.

TunerMaxima3000

iTrader: (4)

I heart this guy. Thanks dude for the concrete information, so rare on a forum!

Finchum

Thats where it needs the power too. The VIAS removal dropped the power in that range.