Twin Exhaust For Sedan

[Deep Dish V35]

For anybody wanting to try a twin rear setup, here is one i knocked up yesterday.

So, in this example, im keeping the centre muffler, adding a new flange about 200mm behind that muffler, and bolting this onto it.

First thing was to replicate the original bumper cutout to the drivers side.

Its all 2.5" parts... flange, single to dual collector, all 2.5" mandrel bent tube, a dual 3" tip on each side.

under the car, it clears the breather canister but require removal of the other part that vents into the chassis and rerouting of the pipe that fed it.

Noise level with this setup is a bit too much in my opinion, but my partner says its ok. i find it drones too much between 1500-2000rpm. A bit like a didgeridoo.

but anyway, i just made it as a trial... will try adding a 12" long glasspack resonator before each tip later. will need to relocate that canister first tho.

Edited June 18, 2012 by Deep Dish V35

[Nightcrawler]

Looking good mate.

[itpesaf]

how much did it cost?

Could you make one for me if I pay?

[Deep Dish V35]

total including welding wire was $300

id rather just draw up a plan of it than fabricate another hahaha

http://img.photobucket.com/albums/v716/sc850/random%20forum/98287b68.mp4

Edited June 18, 2012 by Deep Dish V35

[Nightcrawler]

Wow, sounds freaking awesome!

[sonicii]

Your left and Right straight sections are back to front!

looks good though!!

[Deep Dish V35]

Your left and Right straight sections are back to front!

looks good though!!

how so?

[sonicii]

the left straight section has a R on it and the right straight section has a L on it.. sorry, just being pedantic..

[Deep Dish V35]

oh hahaha yep thatd annoy me too if it was visible..!

OK so now an update for this setup

it was too loud (for me) from 1500-2000rpm so ive added a pair of glasspack resonators. They are a centre muffler from an EF falcon, $45 each brand new, 2.25" bore, i had the ends put on a swage and expanded so they slip over a 2.5" pipe.

the result is... no more drone! Its louder than the standard muffler but quieter than the first design. i'd describe the sound as somewhere between VN commodore and BMW E46 M3.... an odd comparison, i know. unfortunately it has lost most of that VQ burble that you heard in the first video... changing the resonators for hotdogs might fix that..... or of course changing the main centre muffler...

the clearance issue with the vapour canister.... just need to install a shield rather than relocate it. the pipe running down the right side used to connect to the breather which i have deleted for now but will relocate elsewhere. There is at least 200mm of air gap above the resonators, nowhere near the fuel lines that feed the canister

and the video of it completed

http://img.photobucket.com/albums/v716/sc850/V35/twin%20exhaust/f2bafa8e.mp4

Edited June 18, 2012 by Deep Dish V35

[Howaitonaito]

Looks good man. Off topic are they USDM taillights?

[Deep Dish V35]

thanks people!

yep taillights are US - red indicator lenses

[Howaitonaito]

Did not think they were legal, they look good

[Deep Dish V35]

technically nothings legal. roll the dice

[n15m0]

would be interested to see a before and after dyno on this..given the additional length of piping to the 2nd outlet would you actually lose power from this setup?

Looks pretty good otherwise.

[Deep Dish V35]

being a 250gt, id say its minimal, if anything at all.... with just straight pipes it broke into wheelspin much easier, but i doubt it was from a huge power increase.

the one thing i have noticed with both setups is a definite point in the rev range where the exhaust note seems to clash with something... its not a horrible noise, just sounds like 2 different notes at once...

still havent installed the plenum spacer either... but ive heard a rumour about a different plenum that has bigger gains which i'll do some research on.

Edited June 18, 2012 by Deep Dish V35

[t5iv]

Looks great! Well done mate. Excellent initiative.

[Deep Dish V35]

improved fuel economy now too

from 12.2L/100km to 11.7L/100km on the screen... will calculate it properly to be sure

Edited June 20, 2012 by Deep Dish V35

[Deep Dish V35]

action vids

no noise when driving normally, nice note under acceleration

and yes all within local speed limits

http://img.photobucket.com/albums/v716/sc850/V35/twin%20exhaust/98637495.mp4

http://img.photobucket.com/albums/v716/sc850/V35/twin%20exhaust/06945b11.mp4

Edited August 13, 2012 by Deep Dish V35

[Nightcrawler]

^^ how good are your welding/fabrication skills? I need to redesign my high flow cats to get more clearance (as we discussed at the V35 meet)

[Deep Dish V35]

my welder is only 100amp, not enough penetration for exhaust standards. ive had a fab shop go over the lot after i was happy with the setup

p.s. second vid added