Exhaust question - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

SHIFT_*grind* · 09-21-2007, 08:29 PM

Installed a divided turbo elbow (generic XS power), 3" test pipe, and custom 3" exhaust on my SR'd S13 (already had a 3" DP). I bought the exhaust used from a local guy; it's 3" piping up front, welded to an HKS Hi-Power rear section. It does have a resonator welded into it.

And it is fucking loud as hell. At idle it sounds great, really deep rumble, but under acceleration...Jesus. Just rolling around town and staying out of boost, it's just obnoxious. Really drones at lower RPMS, between 1.5K and 3K. Oddly enough though, at higher RPMS and WOT it's not too loud, sounds really good.

Is there any reason not to think that cuttting out a section of the exhaust and welding in another 3" muffler would help quiet it down a good bit? I like the way it sounds, it just needs to be about 20 decibels quieter for around-town driving

Neejay · 09-21-2007, 08:35 PM

No, go ahead and weld in a round muffler (magnaflow's are good) to quiet it down. It will definitely quiet it down...maybe just a 14" length one?

**Phlip** · 09-21-2007, 08:38 PM

^^^ That man speaks the truth.
I have this one in my own custom exhaust:
http://store.summitracing.com/partde...5&autoview=sku

garagelu · 09-21-2007, 09:32 PM

are you sure there isn't a leak somewhere causing the loudness. HKS hi power mufflers are supposed to be quieter than most 240sx exhaust systems out there. HKS just has a deep grunt. Not loud at all.

SHIFT_*grind* · 09-22-2007, 08:15 AM

Quote:

Originally Posted by PHLIP

^^^ That man speaks the truth.
I have this one in my own custom exhaust:
http://store.summitracing.com/partde...5&autoview=sku

Really? That doesn't look like it would quiet it down much

This one looks decent: http://store.summitracing.com/partde...5&autoview=sku

Also, could the fact that I have a test pipe, rather than a cat, make my exhaust a lot louder? I didn't really think of that...

**Phlip** · 09-22-2007, 10:32 AM

Quote:

Originally Posted by RB200SX

Really? That doesn't look like it would quiet it down much

This one looks decent: http://store.summitracing.com/partde...5&autoview=sku

Also, could the fact that I have a test pipe, rather than a cat, make my exhaust a lot louder? I didn't really think of that...

Any additional muffling will have additional quieting properties, the specific amounts are left to your own personal preferences, mine is quiet enough for me.
Having a test pipe is probably another of your issues, as well.

jazzy240 · 09-22-2007, 06:44 PM

Put the stock cat in or a high flow cat and it'll be pretty quiet. That's what I have right now and I want louder. I have the same cat back too.

MavericStephenc · 09-22-2007, 07:00 PM

i have an sr with a full exhaust system with cat delete and its quiet.

check for exhaust leaks.

mabye put in an additional muffler

for reference its an s14 with a gt spec dp, gt spec cat back, and cat delete

09-21-2007, 08:29 PM	#1
SHIFT_grind Nissanaholic! Join Date: Nov 2004 Location: NWA Age: 42 Posts: 2,066 Trader Rating: (7) Feedback Score: 7 reviews	Exhaust question Installed a divided turbo elbow (generic XS power), 3" test pipe, and custom 3" exhaust on my SR'd S13 (already had a 3" DP). I bought the exhaust used from a local guy; it's 3" piping up front, welded to an HKS Hi-Power rear section. It does have a resonator welded into it. And it is fucking loud as hell. At idle it sounds great, really deep rumble, but under acceleration...Jesus. Just rolling around town and staying out of boost, it's just obnoxious. Really drones at lower RPMS, between 1.5K and 3K. Oddly enough though, at higher RPMS and WOT it's not too loud, sounds really good. Is there any reason not to think that cuttting out a section of the exhaust and welding in another 3" muffler would help quiet it down a good bit? I like the way it sounds, it just needs to be about 20 decibels quieter for around-town driving

09-21-2007, 08:38 PM	#3
Phlip Yes, I look like that Join Date: Mar 2002 Location: In my supervillain's lair Posts: 27,980 Trader Rating: (19) Rides Gallery: Phlip Feedback Score: 19 reviews	^^^ That man speaks the truth. I have this one in my own custom exhaust: http://store.summitracing.com/partde...5&autoview=sku __________________ Weirdo And I write too!

09-22-2007, 07:00 PM	#8
MavericStephenc Zilvia Addict Join Date: Aug 2006 Location: salem mass. Age: 37 Posts: 830 Trader Rating: (0) Feedback Score: 0 reviews	i have an sr with a full exhaust system with cat delete and its quiet. check for exhaust leaks. mabye put in an additional muffler for reference its an s14 with a gt spec dp, gt spec cat back, and cat delete __________________ That kind of attitude is SHIT. People with that kind of complacent outlook on law and government are the bane of this country's existence. -Thesquidd Boycott Berkeley and code pink

09-21-2007, 08:35 PM	#2
Neejay Post Whore! Join Date: Jan 2004 Location: lol Age: 39 Posts: 2,586 Trader Rating: (2) Rides Gallery: Neejay Feedback Score: 2 reviews	No, go ahead and weld in a round muffler (magnaflow's are good) to quiet it down. It will definitely quiet it down...maybe just a 14" length one?

09-21-2007, 09:32 PM	#4
garagelu Nissanaholic! Join Date: Aug 2005 Location: Atlanta, GA Age: 40 Posts: 1,856 Trader Rating: (60) Feedback Score: 60 reviews	are you sure there isn't a leak somewhere causing the loudness. HKS hi power mufflers are supposed to be quieter than most 240sx exhaust systems out there. HKS just has a deep grunt. Not loud at all.

09-22-2007, 06:44 PM	#7
jazzy240 Join Date: Sep 2007 Location: Ft Walton Beach Age: 40 Posts: 23 Trader Rating: (0) Feedback Score: 0 reviews	Put the stock cat in or a high flow cat and it'll be pretty quiet. That's what I have right now and I want louder. I have the same cat back too.