Haha... Touge mate. We always feel one another other. Yes learning curve. I think im going to buy a stock header and reinstall.Veloc,
Feel bad about the result of the modification.
Another try an error/experiment will cost you along the route.
Just sit back & relax for awhile.
Maybe can discuss with the tuner/expert on this.
I feel you bro...
Your stock header was cut out, not removed?Each curves at header plays a role, be it inlet diameter, how long the curve is and how long is section of 4/2/1. Without proper understanding an output of the engine a simple mod could just contribute loss rather gain. For your engine, i recommend FGK 4-2-1, improves almost all range from low to high rpm even for a stock heart. Private me if you interested.
Not possible unless bro Veloc willing to ship to car over from Borneo just for sake of exhaust.
Yes bro after some thinking, I came to the same conclusion too. Piping. Mid boxes are same size. But slightly bigger shouldn't be a problem right? Since it will taper off back tot he same piping size shortly.Veloc - my take on this is this :
Last time I had my power band shifted up like you was when the flow of the exhaust was too 'smooth' or 'slow'. I had to add restrictions like a S-flow muffler to normalise it. So to me it sounds like you might have the same issue. 4AGE being a 1.6L, I'm thinking the 2.3" piping probably is too large. Like what most of the sifus said here, I think your issue is the large piping. I don't see a problem with adding the additional mid-box, but this is just my personal opinion.
What is the piping size from header right to the back? The mid-boxes are the same size as well or step up/down piping sizes?
Really? I thought big to small is actually good coz it speed up the exhaust gasses?Big taper down to small will cause some scavenging loss I think. Better to have all same size la.
Big to small not bottle neck meh?Really? I thought big to small is actually good coz it speed up the exhaust gasses?
Restrictive same like bottleneck but mention back pressure sometimes we need a little back pressure for low end....Back pressure la.. it's restrictive.
Big to small not bottle neck meh?
Back pressure la.. it's restrictive.
I have come across so many different theories and advices. Some say small to big.Restrictive same like bottleneck but mention back pressure sometimes we need a little back pressure for low end....