The results are borderline amazing to me. I installed one of those cheap Summit clamp-on 3" cutouts into my I-pipe. With it open the car went 11.25 @ 121mph with only a 1.76 60ft. As I did my burnout I realized I had forgotten to air down the tires from the drive to the track so I eased it out of the hole - Thus the crappy 60ft. The car is pretty consistent. Seems regardless of weather the car always runs 11.55-11.58's at 118-119mph. Another thing I did was install a shift light. It turns out my factory tach is slow by 1500RPM so I've been shifting the motor at 5500-5600RPM the entire time. I can't comprehend why this car is so fast considering the parts it has and the lack of effort put into it.... Just sheer dumb luck. The car weighs 3496lbs with me in it plus when I drive it to the track I lug along about 80lbs worth of tools. Hopefully some time this week I'll figure out why my nitrous isn't working and I'll make a spray pass with it.

awesome times man, i'm hoping to be able to do something similar with my car soon. any suspension work?

Car has non-adjustable Spohn LCA's & relocation brackets, and the front sway bar removed. Other than that it's all stock. Still no sub frame connectors or roll bar.

care to give out some ballpark cam specs on that thing? how high do you have to spin it?

Sounds like were both on the same page. I have similar times as you and am also pretty damn surprised given the lack of racing parts that I have. When are you going to get out next I think a race between would be interesting and very close.

What is your best non-cutout track time? How much improvement did it make & where did you put the cut out at? Pre-cat/Post-cat?

Single 3 inch is way too restrictive for your car, hell it was even for mine. I was running mid 13's one week, cut the exhaust off, went back and ran a 12.22. Exhaust went back on and the car slowed down a lot, again.

I had dual cutouts on my 383 i destroyed, it went 8.7 in the 1/8th, with them on running thru the I pipe, took the caps off and went 8.3. Some cars do not gain much, but they are usually stockers.

I've been trying to tell people that a free flowing exhaust system will make a big difference if the current one is restrictive. I've seen too many people miss out on power because of a restrictive exhaust and bs mufflers. Let the engine breath so it can do what it wants to do.

It's huge on paper but completely streetable. it's in the 260's @ 050 and on a 110LSA.

Not sure, maybe thursday or friday... I got a problem with my nitrous I can't seem to figure out beforehand.

I've always known my single 3" was a huge restriction but it seems people never bother finding out how big of a restriction such things are so I did some testing. This whole car is built using questionable parts and even though it looks pretty nice in pictures the car is literally a huge POS. It's hideous, leaks every fluid imaginable, has a birds nest for wiring, no safety equipment, etc. I built it in my backyard with no garage and only a basic set of hand tools that I can fit in a toolbox in the hatch - Believe me, I'm not bragging about any of this but I do think it's funny that cars with a lot better parts run slower than it.

I was suppose to test dual cutouts on my 3" y pipe into single 4 inch setup. Just to see if it was restrictive. Never did it tho.... sad

There is alot of good power to gain sometimes with open exhaust that has the correct collector length for the combination... thats the key. Just cant stick them anywhere and expect to gain.

I had my exhaust off for a couple of passes last fall. The car ran roughly the same ET. The only advantage for my car was the 40-50 pound weight saving. A good free flowing exhaust will not hamper performance.

Now having a relatively quiet street exhaust and running a race exhaust are two different things. My Magnaflow 4" race mufflers are not street legal but they quiet the exhaust enough that I don't need to wear ear plugs.

Using cutouts is the easiest way to see how restrictive your exhaust is because you're still carrying the full weight of the exhaust system. Running open exhaust may not give the best performance because there's zero back pressure. Many cars still need some back pressure.

no car needs back pressure, they all need exhaust velocity, you have the two confused.

That lil 355 is puttin' some power down... nice job!

I ran that MPH on a 100 shot with my old setup. Damn I'm slow!