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Alright...the GB for the Megan Racing catbacks took a back seat because of ordering and other things so I was going to still buy it off of e-bay for a little more money but it looks really nice but had one question.
It is polished and reduces to 2.25" piping right near the cat. If I order it, cut it, and then try to weld on a very short 2.5" section to the cat, how hard is it to weld to the previously polished section? Can't I just grind down the end and weld on my new piece? Hopefully this all makes sense. I assumed I could do that but just wanted to check. I don't want to be stuck with a 2.25" exhaust.
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'97 SE-R with BB T25 setup, G20 ECU, E-Manage, Starion FMIC, SPEC 6 puck stage 3 clutch, D2 coilovers, fully shaved doors including side molding, Royal Sapphire Pearl (Toyota Supra) paint, Halo headlights, Aerogear vented hood, 98 Sentra Grille, Vis Extreme front bumper, Andy's Autosport rear bumper, and Kenwood Excellon CD player (Formerly Raser-X's car) http://www.uwm.edu/~elh3/Pictures/20...rbocharger.jpg
you can basically weld anything you want EXCEPT for RUST (well you can but it will last for about two seconds before everything else falls out)
So to answer your questions just make sure that what you want to weld is cleaned up, (e.g. the metal is shinny and not dull) ALSO make sure that you disconnect your battery cable on the car so you don't get any ac feedback into your car and espically the ecu.
another word of advice is this double and triple check everything before you start welding because its alot easier to move things before they are welded than they are after
hope that answers your question
joe a.k.a WigGY
oh if its stainless steel (you can tell by placing a magnet on it if the magnet dosen't stick its stainless or some other non-ferrous metal) you will need to use either a TIG WELDER or a stick welder with Stainless rod
...
oh if its stainless steel (you can tell by placing a magnet on it if the magnet dosen't stick its stainless or some other non-ferrous metal) you will need to use either a TIG WELDER or a stick welder with Stainless rod
304 stainless (austenitic) is NOT magnetic
409 stainless (ferritic) IS magnetic
Both grades are used for exhaust systems, 304 is better but more $.
It's just a T25, I don't think you really need a 3". This is just a huge debate I know, my buddy has a 2.5" DP to 3" catback and it's fine. I don't see how much different a 2.5" all the way through is. The exhaust can only flow as much as it's smallest diameter section.
Quote:
Originally Posted by Friend of mine
What do you want to do with it? Always ask yourself that.
2.5 will give nice low end and stop breathing in the uppers
3 will change your spool and give you way more power top end
2.5 sounds good
3 sounds awesome, but tends to be VERY loud! Diesel tractor loud!
In the end if you take the same car side by side, one with a 2.5 and one
with a 3, the 2.5 will put ahead through 1st, maybe 2nd...but when you cross
the 1320 the 3 will be ahead without a doubt!
Last edited by Tomcat5678 : 07-06-2004 at 05:48 PM.
Now I have to think of when in the near future if I do a turbo upgrade to a modded T25 or possibly a little bit bigger will the 2.5 keep it spooled quicker and still be able to force enough air out in the upper RPM range or not. I have done research but am always looking for new test proven data.
...The exhaust can only flow as much as it's smallest diameter section.
not true - as exhaust gas cools down the pipe, it needs an increasing pipe diameter to keep the velocity up. I know a lot of NA Honda guys w/ 2.5" axle backs using 60mm (2 3/8") B-pipes - they say it flows like a 2.5" up top w/o losing any down low like a full 2.5" would
it doesn't help keep high gas velocity - at least when you're off boost, when you're on, you're making a lot more power, flowing a lot more air and needing a freer flowing exhaust. It may not matter much either - Kojima's new header actually showed an increase in low end power w/ a 3" collector and S5's
it doesn't help keep high gas velocity - at least when you're off boost, when you're on, you're making a lot more power, flowing a lot more air and needing a freer flowing exhaust. It may not matter much either - Kojima's new header actually showed an increase in low end power w/ a 3" collector and S5's
yesh, but those are also big a$$ cams that warrent such a large exhaust. i don't think the same type of gains would be seen with s3's
