Recently purchased one and can't decide whether to keep the stock single turbo or go with a holeset that I have that works very well. Going to keep the internals stock. Im sure others have done this? Do they hold up? Any input to help me decide which turbo to go with would be great . I have management system already in place. The 1j stock is supposed to be 280 HP. Never got to dyno my 7mgte with the holset. People were guessing it was 500-600 HP. Just wouldn't hold up the even with all the goods in it.just don't want to blow up this 1j with the bigger turbo. Any input would be sweet. Any 1jzgtevvti guys out there with management and stock lower internals?