That is true about Low End Torque. I went to a 2.5" full exhaust from the manifold back with a Highflow CAT and I could feel the low end suffer..
the only reason that I did it though is that I plan to go Turbo soon and I had the chance to get the Exhaust installed first... Now that I have the rest of the Turbo parts (except Intercooler) I will be starting that project this winter...
So, stay to 2.25" max if you plan to run N/A to keep low end
no dude, i mean LOOSE HIGH END. if your exhaust is open your motor has nothing to work off of. AKA back pressure!
plus you loose torque at high RPM´s...
nodaford, just the accesories
Well the reason I´m asking is b/c I got the header from a 89-90 GT Scort and I´m going to put that on in replace of my stock exhaust manifold and its going to take the place of my CAT. Where the two ends meet under car is where the GT CAT is suppose to be, I just have stock LX pipe running all the way back to the dual tip muffler. I´m just going to stick with my original plan and just add the header and forget the CAT for later. I got to change the oil pan gasket and I don´t feel like fighting with adding another CAT to repalce the one up front. That´s one thing about LX´s, the CAT is right in front of the engine. I´m hoping that will take some heat of the compartment when its gone. I´m going to finish making up a custom cold intake for my CFI when I get the header done.
Well if you plan on upgrading later James it isn´t bad to go 2.25". I went 2.25" and I have the turbo on. I´m actually not going to go 2.5 all the way. The OEM downpipe for the VJ20 is 2.25". So go 2.25" have fun...go turbo, still have fun, then go 2.5" in the distant future if your power hungry....who knows, if you decide to run enough boost you might want to go 3" and let the turbo keep the necessary backpressure.
if i get the turbo on and i get it up and running i don´t plan on making more than 300 hp unless i get some NOS for low-end-off-the-line-power. I just don´t want to run the chance of blowing up my newly built motor (yet i haven´t done anything yet). 250 is enough for me. I just want to get low 14/ high 13 quarters to spank my frinds Mustang GT, unless he gets a supercharger. then i´ll think about some 300 horses. And i can always find a nice sized V6 motor out of a 1st gen SHO and turbo that. Anyway, I´m not worried about my engine as of yet. If i get another job i might start stocking things as fast as possible to start building up my car.