A 250 dollar wb isnt high end. Thats still budget enthusiest level equipment.
The biggest factor on accuracy is the quality of your unit.
Install is the easy part a long as there are no exhaust leaks.
If you had googled the terms i suggested you would have found a proper wb comparison with a top quality lab grade unit as the reference.
Seems these budget wb's are as useless as narrows.
You could make your own headers that fit, if you have the skill. Since you dont want to/think its possible, get a plog. Itll crack though, so be prepared to weld it when it does.
Is3 requires valve guide clearance, not ported heads.
