The truth about JDM catback exhaust systems...

[SlimFastSupra]

APEXi N1:
75MM Piping Front
85MM Piping Rear
Full Size Resonator
85MM Inlet Muffler, but less then 3" at exit

HKS Hiper:
75MM Piping Front
85MM Piping Rear
Full Size Resonator
85MM Inlet Muffler, but less then 3" baffle at the exit

HKS Super Drager:
75MM Piping Front
Small 75MM Front Resonator
85MM Piping Rear
Full Size 2nd Resonator
85MM Inlet Muffler, but less then 3" baffle at the exit

Tanabe Medallion:
Stainless Steel 2 piece
75MM piping all
Full Size Resonator
Full Size 3" muffler, but less then 3" baffle at the exit

RSR GT2:
Steel, 2 piece
75MM Piping
Full 3" race bullet muffler

Blitz NUR SPEC R:
Stainless Steel, 2 piece
75MM piping front pipe
Small race resonator
85MM piping rear
85MM inlet muffler to 3" outlet straight through



If you have any of these systems, look in the back and see if the exit hole deep inside the muffler is actually 3" or more. Out of all of the above systems, none of them were 3". I will soon have pictures to show.

These exhaust systems are baffled to conform to the JDM exhaust noise law. If you want the real power out of them, cut out that baffle!! I suggest everyone that doesn't mind a louder exhaust to get to cutting inside.

Here is a picture of a Megan Racing muffler (unmodified). Look ma! A 2.5" pipe will fit THROUGH the muffler because it is a true 3"

http://img.photobucket.com/albums/v208/935motorsports/84/DSC00070.jpg



:eek2:


Here is a real HKS Hiper 3" inlet universal muffler. Look, I can't even get a 2.5" pipe to go in the rear because of the stupid baffle! This muffler is $200, what a rip!!

http://img.photobucket.com/albums/v208/935motorsports/84/DSC00072.jpg
http://img.photobucket.com/albums/v208/935motorsports/84/DSC00073.jpg



So, for all of you people paying $600+ for JDM exhaust systems, here is the truth for you. Some of you have a 2.5" exit, HAHA.

Please take pictures and measurements of the exit hole on your JDM exhaust system for reference!!

As far as I know only the Blitz NUR SPEC has the full exit size as advertised, which also explains why it is so loud.

[Thermactor]

http://www.thermactor.com/ohsnap.jpg

1) Now I don't feel so bad anymore for having the Megan
2) Now here's a good reason why people call the HKS systems quieter... it's because they're more restrictive!

[Suprawill1]

As far as I know only the Blitz NUR SPEC has the full exit size as advertised, which also explains why it is so loud.
Bingo! That's why I have it. It also comes with a silencer that is not a 3" but a 2.5" exit hole but reduces low to midrange drone. But if you want it all, remove that silencer and go for flow. Best of both worlds!
I think that the other kicker is that it's FULL SS, not just the piping or just the muffler, and can be had for low $500s.

[Zerocool084]

uhm... I'll stick with my RS*R ;)

[brewster]

So how deep into the muffler is the baffle?

[illmatic357]

sticky this

[outofstep]

Very good info. Nice find

[GotToyota?]

So the best exhaust systems are the RSR GT2, and the Blitz Nur Spec?

[toyota_supra_1988]

hmm this is pretty interesting. Never knew that, maybe this will change my thoughts about the hks super dragger. also how hard would it be to remove the baffle?

[jblaze]

I have the Apexi N1 and my exit on my muffler is smaller as well, but my car is LOUD AS HELL!! If I remove the baffle, cops will come looking for me no matter where I go.

[PbXAssassinX1524]

So the best exhaust systems are the RSR GT2, and the Blitz Nur Spec? Like we didn't ready know :p

Anywho, this just even further goes to show that the NUR spec is the best bolt on exhaust made. :)

[Supra Junky 101]

I love my nur spec .. I have it on my car now until I put on my other exhaust which
I can fit my entire arm until my shoulder into...yay for Tanabe :)

[dbsupra]

i have the apexi gt spec. it is 4" inside the muffler itself.

[jbsupra89t]

I don't even think the RSR is stainless piping, no?

[MaliCali]

i dont spend rediculous amounts on exhaust anyways..

exhaust shop can make you an exhaust for like 70 bucks all the way up...minus the cost of a muffler...

as long as the bends are the same...a 4" pipe is a 4" pipe...

[TaSe]

yea i noticed that when i had my hks on my car, i seen the baffle because some how it broke

[jbsupra89t]

70 bucks? Show me, that's my next exhaust. I aint even kidding :P

-J

[NJsupraA70]

Great info. Glad I own the nur-spec, I dont mind the loudness. :)

[alanflies]

holy crap...in the pic with the megan fart can, thats gotta be the weirdest lookin foot i ever seen. hehe

good info though

[MaliCali]

70 bucks? Show me, that's my next exhaust. I aint even kidding :P

-J

go to an exhaust shop that only does exhausts....also not to menion....they use stainless steel piping..that (other than titanium exhausts) is ALOT lighter than most exhausts..

-mike

[lenny]

Jdm Power

[jbsupra89t]

I wish it was that cheap out here :( Heh, oh well

-J

[86SUPRA7mgte]

Megan POWER!!!


-Dave

[snake eyes]

so thats why those are so quiet....

mine was done at a local shop, its a 3in from the elbow to the muffler (flowmaster, intresting tone to say the least) for 600, not bad concidering what the other exausts cost

<l><l>

[Suprawill1]

Yeah, show me a 3" SS mandrel bent custom exhaust for $70!
If you can, you must own the shop. Parts alone would total more than that.

[Justin]

i dont spend rediculous amounts on exhaust anyways..

exhaust shop can make you an exhaust for like 70 bucks all the way up...minus the cost of a muffler...

as long as the bends are the same...a 4" pipe is a 4" pipe...


Yes. 200 dollars for me. That's pipe, a glass pack, and a Dual Outlet Tip. The tip and glass pack cost 80 bucks each.

[GotToyota?]

Hold on guys, I'm trying to get this stickied. :bigok:

EDIT: Got it moved! :bigthumb:

[toyota_supra_1988]

nice work man!

[SlimFastSupra]

Given that between everyone in my area we have all of the systems listed above, I will go ahead and take pics and post exact specs for sort of an exhaust comparison.

[SupraOfDoom]

I plan on getting HPF 4" anyway, but nice find.

[tubbie]

I have the Kakimoto N1.......... SS 3.25 inch all the way to the 4 inch silencer with no baffles anywhere.... Loud loud loud.... Sounds good though....

[GotToyota?]

I have the Kakimoto N1.......... SS 3.25 inch all the way to the 4 inch silencer with no baffles anywhere.... Loud loud loud.... Sounds good though....
Do you have any sound clips?

[jbsupra89t]

I want the kakimoto... there's another guy from GA with it too, any clips?

-J

[SDstreetracer]

i dont spend rediculous amounts on exhaust anyways..

exhaust shop can make you an exhaust for like 70 bucks all the way up...minus the cost of a muffler...

as long as the bends are the same...a 4" pipe is a 4" pipe...
Wrong but nice try.

[illmatic357]

http://memimage.cardomain.net/member_images/8/web/2096000-2096999/2096964_24_full.jpg i spend 275 bucks on my system thats a full 3"dp, tp and exhuast off ebay and my exuast is like a 5" outlet with a res attacted bu it comes off i cant wait to here it i think im gonna go to jail if i drive to shorewood (white folk county)

[lenny]

we need something like
http://i18.ebayimg.com/04/i/05/24/db/5d_1_b.JPG
haha

[SupraOfDoom]

http://memimage.cardomain.net/member_images/8/web/2096000-2096999/2096964_24_full.jpg i spend 275 bucks on my system thats a full 3"dp, tp and exhuast off ebay and my exuast is like a 5" outlet with a res attacted bu it comes off i cant wait to here it i think im gonna go to jail if i drive to shorewood (white folk county)
Ha i lived in shorewood when I was young for a year ( although I went to brown street elementry school imagine that :P ). Yeah shit they even had block partys there...

[Suprawill1]

we need something like
http://i18.ebayimg.com/04/i/05/24/db/5d_1_b.JPG
haha
Nice track pipe!

[GetBoost]

I have the tanabe and the blitz nur spec, and the tababe owns! It just sounds the meanest IMO

[SupraDr1ft786]

I have the Kakimoto N1.......... SS 3.25 inch all the way to the 4 inch silencer with no baffles anywhere.... Loud loud loud.... Sounds good though....


No way u got the kakimoto??? Thats the one I plan on getting for my car, I wanted to know if the exhaust exits at an angle??? Also if its 3in. all the way, do u have pics of it??? Also the baffle how u took that out???

[SlimFastSupra]

update,

Changed tanabe catback with 3" race random tech cat to a 3" crush bent with 3" cat, 3" resonator, and 3" dynomax muffler. i gained 1 psi and it is just as quiet (the cat is huge).

I second that the tanabe is restrictive.

[GotToyota?]

The Kakimoto from what I hear is rare. :dunno:

[86SUPRA7mgte]

Nice track pipe!

Wow thats almost as straight as mine.




-Dave

[illmatic357]

hey can i get a copy of ur pipe shit ill sell mine and just buy a elbow on friday i want a long pipe and wi muffler will make me 1 even thow mine is finsh ill sell it

[miekedmr]

So it's bad to have mufflers that actually muffle? I would rather have one with baffling, honestly, and lose 2hp at WOT at redline.

[UNITEDMASTER]

Good work,I got my megan on ebay 65bucks nice quality true 3in and 3in out muffler,no need to spend hundreds on xaust there just gonna get banged up anyway.

[jdmk3_87t]

Magnaflow anyone...

[JSupraman]

update,

Changed tanabe catback with 3" race random tech cat to a 3" crush bent with 3" cat, 3" resonator, and 3" dynomax muffler. i gained 1 psi and it is just as quiet (the cat is huge).

I second that the tanabe is restrictive.

What kind of dynomax muffler did you go with? Trying to decide between magnaflow or dynomax.

[ViperKiller11]

75 millimeters = 2.95275591 inches
So i dont see the huge problem here. Having a .048 reduction is not really going to make a difference.

[suprafantx]

Sticky please

[PbXAssassinX1524]

It's in the FAQ section already...