Eccentric N54 Intake Manifold Alignment Inserts. Introducing the N54 intake manifold alignment inserts for precise alignment during the N54 intake manifold swap These inserts alleviate the need for tedious manual creation of the inserts from stock ones. This kit includes 6 inserts and not 7 since the middle insert is a smaller diameter and in our testing is not needed for structural integrity. --------------------------------------------------------------------------------------------------------------------------------------------------------- While the 3SIM manifold swap is beneficial, the N54 manifold offers significant performance gains at a fraction of the cost. With used N54 manifolds typically costing between $70-$150 and no moving parts (such as Disa valves), the N54 manifold swap is an excellent value proposition. Compared to the 3SIM costing $400-$600 plus an Tuning $400 and depending on the condition of the 3SIM Disa valves they might also have to be replaced so an additional $500. 3SIM Costing a total of $800 all the way up to $1,500N54 Swap only around $300 (these inserts included) DynoJet Report is all the proof you need to go with the N54 Swap --------------------------------------------------------------------------------------------------------------------------------------------------------- The N52 was predominately found in the:E90 325i, 328i, 330i, and the E60 525i and 528i modelsas well as various 128i, X1, and Z4. The N52 was produced from 2004 until 2015 when it was replaced by the turbocharged N20 engine. --------------------------------------------------------------------------------------------------------------------------------------------------------- The BMW N52 is a naturally aspirated straight-six petrol engine which was produced from 2004 to 2015. The N52 replaced the BMW M54 and debuted on the E90 3 Series and E63 6 Series. The N52 was the first water-cooled engine to use magnesium/aluminium composite construction in the en