NZ-GTT

+1 for the HKS super turbo muffler. It is straight through design with no restrictions or reduced diametetrs inside the mufflers. I just bought one second hand on BidJDM for $500 plus shipping. Quiet too for a straight through design. Have a look on youtube.

All 3 blocks I have used in this comparison have the oil and water feeds drilled and tapped on the hot side of the engine block. They all have tapped holes below the water pump for an idler and tensioner and all are machined flat above the water pump where the relocated tensioner would go.So I presume they are all S2.

This is my first post here but I have been trawling on here for some time and I would like to thank SAU for the valuable information I have found here. Anyway I know this is an old thread but I would like to share a difference here between the blocks.I have 2 VL blocks and one R31 RB30. I noticed that the bearing caps of the girdle on the R31 is 2mm thicker and it ways 9.6 kg vs 9.2kg for the VL ones, so it would definitely seem that the R31 crank girdle is beefier. I would be interested to know if this is consistent between these blocks if anybody else has an old R31 or VL block laying around.Some pictures below: