engine "noise" at 2000 rpm only?

[gorkyb]

Ouch! Welcome to the cracked manifold club, I asked my great welder friend to weld that crack for me, it lasted about 6 months, then he rewelded it 3 months ago and it's been holding good so far. Unfortunately there is no cheap fix for this other than trying to weld it but as you can see by my experience that doesn't always work. I'm sure more specialized welders can do a better job, cast iron sucks, it needs to be superheated before it can be welded. The new manifold option will cost you around $350 which is an aftermarket manifold, Calmini is the best according many. See fixkick hard to find parts page for guidance. There are rumors of OEM manifold still being sold in some suzuki dealerships but even if true, they are almost as pricey as the aftermarkets and will likely break again. The aftermarket makes them from stainless steel rather than cast iron.

Once that crack opens enough to leak air it will drive your upstream O2 sensor crazy and you'll start having all sort of issues. I'm really sorry for the bad news. It doesn't matter where in the world you go, these manifolds are expensive. I went to Ecuador where they still made these cars brand new until 2013 and tried getting one of these manifolds brand new thinking it would be cheaper, I was wrong! They priced me over $400 in more than 3 places.