Kim

I have been wanting to make a true dual system for my car ever since I got it.
So when a curb jumped up and broke my exhaust during a trackday, I decided that now is the time
I had some flanges plasmacut at work, and bought som regular steel, stainless steel, resonators and gaskets. Then started the fabrication of the system.
Now it is finally done and I must say that this thing kicks *** like you wouldnt believe it.
Regular two inch steel homemade header into two inch Stainless Steel resonators and on to stock mufflers(allmost new). For trackabuse Ill be using two inch SS resonators instead of the stock mufflers, mated to some "diesel style" tips to direct the sound into the ground

Anyways im in love with my car again, now it is quiet and comfortable in city traffic and roars like a beast at wot, did I mention that it has TORQUE now

My setup: All Euro-spec motor, no emissions-working aux.butterflies, ported motor, matchported manifolds, drop-in K&N filter, true duals and "flowed" intake(TB-Elbow-AFM).

Im ready for a dynorun soon

marlaman

Looks Good holmes, how loud is it on a scale of 1-13? 1 bring the quietest.
Matt

Kim

Uhmmm this is just a wild guess but maybe around 4 or 5

Dom_C

that is absolutly sick. i would love to have those. . nice job looks good, curious to see the dyno numbers.

Aesop Rock

nice work, 4-5? are you seriosus? would you like to make more?

1987RX7guy

iTrader: (3)

Nice man.


Santiago

Kim

Thanks
And no I dont think it would be worth it for me to make exhausts and ship them to the US.
<------Denmark

LOL somehow I knew that Santiago was gonna post in this thread


4-5 is normal cruising and im guessing 7 at WOT, 1 being stock system and 13 being full open exhaust.

Hopefully I will post some pictures of the two styles of rearmufflers/raceresonators one of these days.
Stay tuned

1RevvinFC3S

And 36.784689 being Perepheral Ported with a 3.5" collected header.

Kim

I had my brother inlaw make some 3" tips for her today.
Just felt like sharing

zeromage428

man, those r so nice!!!!!!! Yous should make them n have someone sell them on thier website

3RotorRocket

Not Bad

Aesop Rock

i have my mig welder ready, you used Stainless steel right? you mind sharing your list of dimensions/ingredients

inflatablepets

I want dimensions and more pics. A parts list too. I am interested in making a similar setup.

Aesop Rock

your avatar still gets me man

josh greene

could you use a pacesetter header cut the end where it goes from two pipes down to one and weld in the rest to make a true duel system????

Everlastingboost

yah i believe so. If you just cut right before the collector and the weld 2 same dimensions pipes as the header itself then you would have a true dual system. I was thinking of doing this myself, im not sure the performance gain would be all that much but from kims butt dyno it might just be worth it hehe. My header needs a new flange anyway. late,kevin.

Kim

Ok here goes:
Header is regular steel, cus im worried about the extraction and the uhhmmmm opposite:oops: when the engine warms up and cools down. Im no pro but Im convinced that regular steel is more flexible. You can buy the stuff at well assorted hardware store. Header consists of Plasmacut 10mm steelplate some 2"inch piping a few 90* bends and end flanges. Its real easy to make if you know how to operate a welder, put the flange on the enginestuds align and mark the bends, take it off and spot weld it together, put it back on align the next section and weld, if you weld it on the car remember to disconnect the batteryground or you may fry some circuits.

Header-->back is Stainless Steel 1,5mm thick and 2" diameter, its coupled together with a few bends that I bought as 90* couplers and I cheated a few places and cut the pipes and bend them over my knee Then it goes into some resonators and further on into the stock rearmufflers.
Go on as with the header and align and spotweld it together, if you, as Aesop Rock mentioned, uses a MIG welder on SS it WILL rust faster than you can weld. Use a TIG welder instead its kindda hard to begin with but gets easier as you go.

This project took me a few days to complete, laying on my back underneath the car, getting burnmarks from the welder all over my body.

P.S. When TIG welding make sure to button up your shirt, I got a nice red tan from welding the SS exhausts

Kim

The Pacesetter headers seems like an idea worth trying, the good thing about True Duals is that the piping doesnt need to be equal length as the exhaust pulses never meet

Aesop Rock

They have a special spool of wire to use on SS steel when you mig weld, turn your currnet on min, and use lower feed. Thanks for the write up, im duing this when my rebuild is over

rx7jake

yeah, that should work as long as you can weld well.

Aesop Rock

You should see my Dads Series II Land Rover Frame, im no expert but im good

inflatablepets

Thanks guys. I've been looking for a etup to build on my own. I will have some design changes, but I'll get the ball rolling soon.

Kim

Bump for the dynotest.

Too lazy to write it all over again so check this link.
https://www.rx7club.com/showthread.p...00#post3500000

Kim

A picture from the dyno.

Kim

Video from dynotest and one of my true duals

http://www.wankelkim.net/exhaust.AVI
http://www.wankelkim.net/Dyno.AVI