hey what would happen if i had my headers connected to 3 inch ehaust all the way down to my flowmasters and out. no cats....no x-pipe or h pipe? what would i loose or gain? anyone......?
No, I dont think he means straight pipes, just no cats but keep the mufflers. I have straight pipes with the cats and I lost alot of low RPM tourqe, but around like 2000 RPM it picks up nicely.
You going to weld the bungs for the O2's? I don't see where it would be any different. I have un-catted h with dumps....so I don't see too much from a straight pipe off the headers to a flowmasters......
i believe you will have alot of popping (backfiring) on deceleration the x and h pipes equalize pressure and helps to prevent the popping or backfiring sound especially during engine deceleration. this type of backfiring sound is undesireable by most people.
You NEED a crossover .... whether it be an H or an X (or even a D pipe ).
I made the mistake of running the exhaust (on my old 302 Ranger) without a crossover. It was a DOG. Once an H was welded in, it was a SCALDED DOG, lol.
Unless you are making 450-500+ hp NA or 400+ hp with a blower, your gonna loose torque and drivability..too many people go 3" too early..bigger is always better is for ricers..
Yep, you need a crossover. The exhaust gasses rushing down one pipe create scavenging momentum to help pull exhaust gasses out of the combustion chamber. During overlap, this will also create momentum to pull intake air in (in addition to that vacuum caused by the dropping piston. That's a general description, but its basically accurate.
I'm going with 3 inch too on a 354 build. No cats, but I am putting a H pipe in.
Flowmasters with turndown at the axle. If you get yours done first,let me know how it worked out for you,mine will be another 3 weeks, waiting on the port man