I just bought a set of cut outs at the hi po store! always wanted some, anyone have before and after numbers with cut outs?
(lie tell me 4 tenths i just need to justify the purchase)

You'll be in the 9's at 108.

http://www.nastyz28.com/ubb/wink.gif

Most of the time a well designed and built full exhaust system will out perform cut outs.

By a well designed sysyem I mean, mandrel bent pipes, X pipe up close to the coll., good flowing mufflers, etc

Cut outs will be faster than stock exhaust, and some run of the mill "performance" exhaust systems.

Now dropping your exhaust and running open headers could gain you a few .00X's be the amount of weight you saved by taking the exhaust off..

Open headers/cuts outs most of the times will make a few HP more in the upper most part of the RPM band, at the cost of a larger amount of torque in the lower and mid parts of the power curve

Did the comparison between exhaust system on and off down in Mission. Weighed the car both ways, 3550 with me exhaust installed, 3490 exhaust off.
Car went 11.12 best with exhaust on, 10.996 with it off. 3 inch duals, Flowmaster h pipe kit, 3 chamber 3" flomaster mufflers. If you go by the old theory that a 100 pounds is worth a tenth, the car ran (by power increase alone) about 5 hundredths quicker. Build a good exhaust system, you won't need cutouts unless you like the sound of open headers.

------------------
Custom Auto, your source for quality machine work, cores and new parts at competetive pricing right here in British Columbia 1-888-563-4050
A Canadian, EH? (with a 10 second street car)

i guess ill try em if they dont help(they probrably wont) ill just leave em closed

If you wanted cutouts, you should've went the ricer route and bought electric cutouts.

http://www.nastyz28.com/ubb/biggrin.gif

JUST KIDDING!!!

Now i can ditch the loud flowmasters for some stock type and hear the radio

I've done like Doug with and without the 3" mandrel bent with super turbos have gained between .15-.2

I've got cut outs on my S10, couldn't hear my own engine at the strip.
On my Camaro I used 3" Warlock mufflers that have removable caps, sounds so nasty I don't care if its any faster.

I did open/closed runs with both and never found any consistant difference, but your car probably go down to 7 flat. http://www.nastyz28.com/ubb/wink.gif

------------------
73RS/LT/427

Round here everyone with cutouts runs 7 flat

------------------
14.22 on the brakes (I expect 13.90's soon)

I installed 2" x 6" long pipe nipples and caps on my First Gen car way back when where the exhaust pipes curved into the driveshaft! They did open her up a schosh TOO!

BUT boy were they noisy right under my front seats!! Say at about 5000/5500rpm in forth gear late at night on the highway by myself way back in '67 going between country towns..

But figure it like this, "my rifle always shot farther, the harder I pulled the trigger!!"

He, He!!

pdq67

I had the electrics on my 69 convertible w/ bbc. Not to sure how much HP I gained, but it was awesome pulling up to a light next to one of those little fast & furious things, opening the dumps and watching thier expressions!

I've got some electronic cut-outs on mine as well. On a chassis dyno I picked up 21 rwhp. But the cutouts are 3" while the rest of the full exhaust is only 2.5".
I've also run at the track with them but I'm such an inconsistent/inexperienced driver that no difference was noticed.

<font face="Arial,Verdana" size="2">Originally posted by Hpd49:
but it was awesome pulling up to a light next to one of those little fast & furious things</font>

Now that's funny!! LOL Fast and Furious things.

I bought the el-cheapos with wing nuts, i guess i can still open um at a light with a passenger helping, most of the lights around here are long!

I love my DMH electric cut outs

------------------
72 RS, ZZ383- 770 Holley, HVH carbspacer and RPM Airgap manifold, flowmaster american thunder system modified with two 40 series mufflers, pro-billet distributer,6AL box, msd super conducter plug wires, powermaster 140 amp alternator and March serpantine conversion.

!!!Piss on C.A.R.B.!!!

How long have you had them on? Any problems with rust and/or corrosion hampering effectiveness?

<font face="Arial,Verdana" size="2">Originally posted by sharpeyewashington:
How long have you had them on? Any problems with rust and/or corrosion hampering effectiveness?</font>

just put them in this week. I will keep you posted, just remind me in a while or shoot me an email.

heres a little vid with them open

http://www.70-81.com/Spinthosetires.mpg

------------------
72 RS, ZZ383- 770 Holley, HVH carbspacer and RPM Airgap manifold, flowmaster american thunder system modified with two 40 series mufflers, pro-billet distributer,6AL box, msd super conducter plug wires, powermaster 140 amp alternator and March serpantine conversion.

!!!Piss on C.A.R.B.!!!

There's no way having that on a car CAN'T kick a$$..... http://www.nastyz28.com/ubb/biggrin.gif

cant wait to get mine on they have been in the back seat since Christmas!

------------------
http://www.supermotors.org/getfile/163599/fullsize/Idlin%20smooth.WMV

Holy smokes Badkarma! That thing takes off like a rocketship! Is that the ZZ383 car??

<font face="Arial,Verdana" size="2">Originally posted by 1978LT:
Holy smokes Badkarma! That thing takes off like a rocketship! Is that the ZZ383 car??</font>

Yup sure is! Would be alot more fun if those damn tires would hook a lil,notice she dosnt squat much or at all. I think I need to ditch the five leaf and maybe get some global west or hotchkis springs.

------------------
72 RS, ZZ383- 770 Holley, HVH carbspacer and RPM Airgap manifold, flowmaster american thunder system modified with two 40 series mufflers, pro-billet distributer,6AL box, msd super conducter plug wires, powermaster 140 amp alternator and March serpantine conversion.

!!!Piss on C.A.R.B.!!!